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[(still )12(req)-6(u)6(ired)-6( \(histo)-6(ry)18( lists, grap)-6(hical b)-6(r)-4(o)-6(w)23(sers, search)]TJ
T*
0.328 Tw
[(engines, )12(etc.\) as so)-6(m)19(e)-2(\227ad)-6(m)19(itted)-6(l)1(y)18( f)8(e)-2(w)23(\227)0(o)-6(f)8( the d)-6(e)-2(sired)]TJ
T*
0.002 Tc
0.23 Tw
[(pag)8(e)0(s m)21(a)0(y)20( h)8(a)0(v)8(e)0( been)8( seen)8( lon)8(g)8( )-12(ag)8(o )-12(\(see )-13(C)6(o)-4(ck)8(bu)8(rn)8( )-12(an)8(d)]TJ
T*
0.004 Tc
0.107 Tw
[(Green)10(berg)10( 1999 f)12(o)-2(r a com)23(p)-2(an)10(i)5(o)-2(n)10( paper )-12(t)5(h)10(at)5( )-12(di)5(s)7(c)2(u)10(s)7(s)7(e)2(s)7( )-12(t)5(h)10(i)5(s)]TJ
T*
-0.002 Tc
[(issue\))-6(.)]TJ
/F3 1 Tf
9 0 0 9 54.04 236.043 Tm
0.002 Tc
0 Tw
[(2.2 )-320(Robust Use in Spite of Na\357v)11(e Models)]TJ
/F7 1 Tf
9.96 0 0 9.96 54.04 224.516 Tm
0 Tc
0.328 Tw
[(A)11(s)3( )12(w)23(ill b)-6(e)-2( d)-6(e)-2(scrib)-6(e)-2(d)-6( in Sectio)-6(n 3)-6(,)-3( current co)-6(m)19(m)19(e)-2(rcial)]TJ
T*
0.063 Tw
[(sy)18(stem)19(s )12(u)6(s)3(e a stack)6( to im)19(plem)19(en)6(t )]TJ
/F11 1 Tf
9 0 0 9 191.8 212.763 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 211.96 212.756 Tm
0.004 Tc
0.059 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 232.6 212.763 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 265.6 212.756 Tm
-0.001 Tc
0.064 Tw
[( b)-7(u)5(tto)-7(n)]TJ
-21.241 -1.1807 TD
0.001 Tc
0.026 Tw
[(beh)7(a)-1(v)7(i)2(or: th)7(e ef)9(f)9(ect is th)7(at a person)7( can)7( u)7(s)4(e )-12(th)7(ese )-12(bu)7(tton)7(s)4( )-12(to)]TJ
T*
0.002 Tc
0.061 Tw
[(m)21(o)-4(v)8(e)0( )12(u)8(p)-4( )12(an)8(d )12(dow)25(n)8( )12(th)8(e sin)8(g)8(l)3(e h)8(i)3(erarch)8(ical path)8( captu)8(red by)]TJ
T*
-0.001 Tc
0.377 Tw
[(the stack, b)-7(u)5(t canno)-7(t use it to)-7( revisit )-13(any)17( )-13(p)-7(a)-3(ges )-13(that)]TJ
T*
0.003 Tc
0 Tw
[(bran)9(ch)9(ed of)11(f)11( t)4(h)9(at)4( pat)4(h)9( as)6( t)4(h)9(es)6(e are popped of)11(f)11( t)4(h)9(e s)6(t)4(ack)9(.)]TJ
0 -1.7831 TD
-0.001 Tc
0.124 Tw
[(In sp)-7(ite o)-7(f)7( this algo)-7(rithm)18(i)0(cally)17( )-13(sim)18(p)-7(le )-13(m)18(o)-7(d)-7(e)-3(l, )-13(m)18(o)-7(st )-13(p)-7(e)-3(o)-7(p)-7(l)0(e)]TJ
0 -1.1807 TD
0.002 Tc
0.109 Tw
[(h)8(a)0(v)8(e)0( qu)8(ite n)8(a)0(\357v)8(e m)21(odels of)10( )-12(h)8(o)-4(w)25( )-12(th)8(e )-12(stack)8(-)10(b)-4(ased )]TJ
/F11 1 Tf
9 0 0 9 255.88 136.203 Tm
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 276.04 136.196 Tm
0.121 Tw
[( an)8(d)]TJ
/F11 1 Tf
9 0 0 9 54.04 124.443 Tm
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 87.04 124.436 Tm
0.387 Tw
[( bu)8(tton)8(s)5( actu)8(a)0(lly)20( beh)8(a)0(v)8(e)0(. W)-6(h)8(en)8( )-13(C)6(o)-4(ck)8(bu)8(rn)8( )-12(an)8(d)]TJ
-3.3133 -1.1807 TD
0.004 Tc
0.252 Tw
[(Jon)10(e)2(s)7( )12(\(1996\) as)7(k)10(e)2(d el)5(ev)10(en)10( com)23(p)-2(u)10(t)5(er prof)12(es)7(s)7(i)5(on)10(al)5(s)7( abou)10(t)]TJ
/F11 1 Tf
9 0 0 9 54.04 100.923 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 74.2 100.916 Tm
0.005 Tc
0.034 Tw
[( )12(bu)11(t)6(t)6(o)-1(n)11( )12(beh)11(a)3(v)11(i)6(or, )12(on)11(l)6(y)23( )12(on)11(e )12(k)11(n)11(e)3(w)28( t)6(h)11(at)6( i)6(t)6( w)28(a)3(s)8( bas)8(e)3(d on)11( a)]TJ
-2.0241 -1.1807 TD
-0.001 Tc
0.197 Tw
[(stack, w)22(ith m)18(o)-7(st o)-7(t)0(hers inco)-7(rrectly)17( )-12(thinking )-12(it )-12(m)18(o)-7(d)-7(e)-3(led)-7( )-12(a)]TJ
T*
0.004 Tw
[(sim)18(p)-7(le histo)-7(r)-5(y)17( list o)-7(f)7( all p)-7(a)-3(ges visited)-7(.)-4( T)-16(h)5(ey)17( )-12(w)22(e)-3(re )-12(then )-12(given)]TJ
26.494 65.3855 TD
0.233 Tw
[(a sim)18(p)-7(le navigatio)-7(nal task, the critical co)-7(m)18(p)-7(o)-7(n)5(ent )-12(w)22(h)5(ich)]TJ
0 -1.1807 TD
0 Tc
0.003 Tw
[(w)23(a)-2(s to)-6( select a link o)-6(n)6( p)-6(a)-2(ge A)11( to)-6( a child)-6( p)-6(a)-2(ge A)]TJ
6.48 0 0 6.48 507.64 715.3 Tm
0 Tw
(1)Tj
9.96 0 0 9.96 510.88 716.876 Tm
-0.002 Tc
0.017 Tw
[(; )12(go)-8( b)-8(ack to)]TJ
-19.3735 -1.1807 TD
-0.006 Tc
0.117 Tw
[(A \()-10(u)0(sing )]TJ
/F11 1 Tf
9 0 0 9 356.92 705.123 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 377.08 705.116 Tm
0.109 Tw
[(\); an)8(d th)8(en)8( select an)8(oth)8(e)0(r lin)8(k)8( to ch)8(ild )-12(pag)8(e)]TJ
-5.9398 -1.1807 TD
0 Tc
0 Tw
(A)Tj
6.48 0 0 6.48 325 691.78 Tm
(2)Tj
9.96 0 0 9.96 328.24 693.356 Tm
0.002 Tc
0.013 Tw
[(. T)-13(h)8(ey)20( w)25(e)0(re th)8(en)8( ask)8(e)0(d w)25(h)8(eth)8(e)0(r th)8(ey)20( cou)8(l)3(d retu)8(rn)8( )-12(to )-12(pag)8(e)]TJ
-1.0361 -1.1807 TD
0 Tc
0 Tw
(A)Tj
6.48 0 0 6.48 325 680.02 Tm
(1)Tj
9.96 0 0 9.96 328.24 681.596 Tm
0.001 Tc
0.219 Tw
[( v)7(i)2(a th)7(e )]TJ
/F11 1 Tf
9 0 0 9 366.52 681.603 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 386.68 681.596 Tm
0.217 Tw
[( bu)9(tton)9(.)0( Eig)9(h)9(t)4( of)11( th)9(e )-12(elev)9(en)9( )-12(predicted\227)]TJ
-6.9036 -1.1807 TD
0 Tc
[(inco)-6(rrectly)18(\227that )]TJ
/F11 1 Tf
9 0 0 9 391.48 669.843 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 411.64 669.836 Tm
-0.001 Tc
0.329 Tw
[( )12(w)22(o)-7(uld)-7( )12(return )12(them)18( to)-7( that p)-7(a)-3(ge.)]TJ
-9.4096 -1.1807 TD
0 Tc
0.316 Tw
[(T)-15(h)6(ey)18( w)23(e)-2(re co)-6(m)19(p)-6(letely)18( unaw)23(a)-2(re )-12(that )-12(p)-6(a)-2(ge )-12(A)]TJ
6.48 0 0 6.48 510.04 656.5 Tm
0 Tw
(1)Tj
9.96 0 0 9.96 513.28 658.076 Tm
0.004 Tc
0.324 Tw
[( h)10(a)2(d been)]TJ
-19.6145 -1.1807 TD
0.035 Tw
[(popped of)12(f)12( t)5(h)10(e s)7(t)5(ack)10(, an)10(d w)27(e)2(re )-12(s)7(u)10(rpri)5(s)7(e)2(d )-12(w)27(h)10(en)10( )-12(t)5(h)10(ey)22( )-12(t)5(r)0(i)5(e)2(d )-12(t)5(o)]TJ
T*
-0.004 Tc
0.007 Tw
[(fo)-10(llo)-10(w)19( thr)-8(o)-10(ugh o)-10(n)2( the)-6(i)-3(r)-8( p)-10(r)-8(e)-6(d)-10(ic)-6(tio)-10(n.)]TJ
0 -1.7831 TD
-0.002 Tc
0.15 Tw
[(W)-10(h)4(at )12(is )12(surp)-8(rising )12(ab)-8(o)-8(u)4(t these f)6(i)-1(nd)-8(ings is that p)-8(e)-4(o)-8(p)-8(l)-1(e\227in)]TJ
0 -1.1807 TD
-0.001 Tc
0.088 Tw
[(sp)-7(ite )12(o)-7(f)7( )12(their )12(na\357ve m)18(o)-7(d)-7(e)-3(ls\227are cap)-7(ab)-7(le o)-7(f)7( using the )]TJ
/F11 1 Tf
9 0 0 9 537.88 605.043 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 317.92 593.276 Tm
0.004 Tc
[(an)10(d )]TJ
/F11 1 Tf
9 0 0 9 336.04 593.283 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 369.04 593.276 Tm
-0.003 Tc
0.126 Tw
[( b)-9(u)3(tto)-9(ns r)-7(e)-5(gula)-5(r)-7(ly)15( \()]TJ
/F9 1 Tf
7.988 0 TD
0.001 Tc
(cf.)Tj
/F7 1 Tf
0.9759 0 TD
0 Tc
0 Tw
( )Tj
/F11 1 Tf
9 0 0 9 462.16 593.283 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 482.32 593.276 Tm
0.133 Tw
[( accou)9(n)9(t)4(s f)11(o)-3(r ov)9(er)]TJ
-16.506 -1.1807 TD
-0.001 Tc
0.245 Tw
[(3)-7(0)-7(%)1( )12(o)-7(f)7( )12(all )12(navigatio)-7(nal )12(acts\). A)10(ll this ind)-7(i)0(cates that the)]TJ
/F11 1 Tf
9 0 0 9 317.92 569.763 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 338.08 569.756 Tm
-0.001 Tc
0.161 Tw
[( b)-7(u)5(tto)-7(n is a ro)-7(b)-7(u)5(st revisitatio)-7(n d)-7(e)-3(vice in sp)-7(ite o)-7(f)7( the)]TJ
-2.0241 -1.1807 TD
0.004 Tc
0.047 Tw
[(poor m)23(e)2(n)10(t)5(al)5( m)23(odel)5(s)7( peopl)5(e h)10(a)2(v)10(e)2( of)12( i)5(t)5(s)7( )-12(act)5(u)10(a)2(l)5( )-12(beh)10(a)2(v)10(i)5(or, )-12(an)10(d)]TJ
T*
0.002 Tc
0.194 Tw
[(in)8( )12(spite of)10( its occasion)8(a)0(l \(f)10(rom)21( th)8(e u)8(s)5(er\222)10(s)5( poin)8(t)3( of)10( v)8(i)3(ew)25(\))]TJ
T*
0.338 Tw
[(f)10(a)0(ilu)8(re to brin)8(g)8( th)8(em)21( back)8( to pag)8(e)0(s th)8(ey)20( )-12(h)8(a)0(d )-12(recen)8(tly)]TJ
T*
-0.002 Tc
[(visited)-8(.)]TJ
/F3 1 Tf
9 0 0 9 317.92 499.683 Tm
0.003 Tc
0.319 Tw
[(2.3 Visual )320(Economy)]TJ
/F11 1 Tf
0 -1.28 TD
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 350.92 488.156 Tm
0.004 Tc
0.059 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 371.56 488.163 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 391.72 488.156 Tm
0 Tc
0.075 Tw
[( )12(are )12(relatively)18( sim)19(p)-6(le in that they)18( req)-6(u)6(ire)]TJ
-7.4096 -1.1807 TD
-0.001 Tc
0.064 Tw
[(o)-7(n)5(ly)17( tw)22(o)-7( b)-7(u)5(tto)-7(ns to)-7( allo)-7(w)22( a p)-7(e)-3(rso)-7(n)5( )-12(to)-7( )-12(navigate )-12(to)-7( )-12(and)-7( )-12(f)7(r)-5(o)-7(m)]TJ
T*
0.002 Tc
0.194 Tw
[(prev)8(iou)8(s)5(ly)20( seen)8( pag)8(e)0(s. T)-13(h)8(ese bu)8(tton)8(s)5( are m)21(odest in)8( )-12(size,)]TJ
T*
-0.001 Tc
0.281 Tw
[(f)7(itting co)-7(m)18(f)7(o)-7(r)-5(tab)-7(l)0(y)17( w)22(ithin m)18(o)-7(st )-12(b)-7(r)-5(o)-7(w)22(ser )-12(to)-7(o)-7(l)0(b)-7(a)-3(rs. )-12(W)-9(h)5(ile)]TJ
T*
0.002 Tc
0.073 Tw
[(u)8(s)5(ers )12(can)8( )12(cu)8(stom)21(ize th)8(eir brow)25(ser to rem)21(o)-4(v)8(e)0( th)8(ese bu)8(tton)8(s)5(,)]TJ
T*
0.001 Tc
0.002 Tw
[(w)24(e)-1( su)7(spect th)7(at m)20(o)-5(st k)7(eep th)7(em)20( arou)7(n)7(d)-5(.)]TJ
0 -1.7831 TD
-0.003 Tc
0.319 Tw
[(I)-7(n)3( )12(c)-5(o)-9(ntr)-7(a)-5(st,)-6( o)-9(t)-2(he)-5(r)-7( r)-7(e)-5(visita)-5(tio)-9(n sc)-5(he)-5(m)16(e)-5(s a)-5(r)-7(e)-5( e)-5(x)3(p)-9(e)-5(nsive)-5( in)]TJ
0 -1.1807 TD
0 Tc
0.22 Tw
[(term)19(s )12(o)-6(f)8( )12(screen d)-6(e)-2(m)19(a)-2(nd)-6(s. Mo)-6(st rely)18( o)-6(n)6( sep)-6(a)-2(rate o)-6(r)-4( tiled)]TJ
T*
-0.001 Tc
0.353 Tw
[(o)-7(p)-7(tio)-7(nal w)22(i)0(nd)-7(o)-7(w)22(s to)-7( p)-7(r)-5(esent a list, tree o)-7(r)-5( grap)-7(h \(see)]TJ
T*
0.004 Tc
0.469 Tw
[(s)7(u)10(rv)10(ey)22(s)7( by)22( C)8(o)-2(ck)10(bu)10(rn)10( an)10(d Jon)10(e)2(s)7( 1997;)5( T)-11(a)2(u)10(s)7(ch)10(er an)10(d)]TJ
T*
-0.001 Tw
[(Green)10(berg)10( 1997\).)]TJ
0 -1.7831 TD
0.002 Tc
0.025 Tw
[(Giv)8(e)0(n)8( )12(today)20(\222)10(s )12(lim)21(ited screen)8( space an)8(d a person)8(\222)10(s)5( ov)8(erh)8(ead)]TJ
0 -1.1807 TD
0.459 Tw
[(f)10(o)-4(r )12(w)25(i)3(n)8(dow)25( )12(m)21(a)0(n)8(a)0(g)8(e)0(m)21(e)0(n)8(t)3(, w)25(e)0( su)8(spect th)8(at people are)]TJ
T*
0.362 Tw
[(relu)8(ctan)8(t to k)8(eep th)8(ese add-)10(on)8( )-12(w)25(i)3(n)8(dow)25(s )-12(on)8( )-12(perm)21(an)8(en)8(t)]TJ
T*
0.097 Tw
[(dis)5(p)-4(lay)20(.)-1( )12(T)-13(h)8(is)5( )12(m)21(a)0(y)20( )12(accou)8(n)8(t)3( partially)20( f)10(o)-4(r th)8(e poor u)8(s)5(e of)10( th)8(e)]TJ
T*
0.005 Tc
0.709 Tw
[(h)11(i)6(s)8(t)6(ory)23( w)28(i)6(n)11(dow)28( obs)8(erv)11(e)3(d i)6(n)11( Mos)8(a)3(i)6(c)3( \(<1%)7( of)13( al)6(l)]TJ
T*
0.001 Tc
0.195 Tw
[(n)7(a)-1(v)7(i)2(g)7(a)-1(tion)7(a)-1(l )12(action)7(s)4(\). )12(W)-7(e)-1( )12(su)7(spect th)7(at th)7(ese w)24(i)2(n)7(dow)24(s are)]TJ
T*
0.002 Tc
0.121 Tw
[(raised )12(f)10(o)-4(r )12(occasion)8(a)0(l )12(u)8(s)5(e )12(an)8(d th)8(en)8( pu)8(t aw)25(ay)20(. On)8(ce \221)10(o)-4(u)8(t)3( of)]TJ
T*
-0.004 Tc
0.236 Tw
[(sight\222,)-7( )12(p)-10(e)-6(o)-10(p)-10(l)-3(e)-6( )12(a)-6(r)-8(e)-6( le)-6(ss like)-6(l)-3(y)14( to)-10( go)-10( thr)-8(o)-10(ugh the)-6( e)-6(ffo)-10(r)-8(t)-3( o)-10(f)]TJ
T*
-0.001 Tc
0.185 Tw
[(raising them)18( f)7(o)-7(r ro)-7(utine p)-7(a)-3(ge revisitatio)-7(n. In co)-7(m)18(p)-7(ariso)-7(n)5(,)]TJ
T*
0.001 Tc
0.038 Tw
[(th)7(e )12(v)7(i)2(su)7(al )12(econ)7(o)-5(m)20(y)19( of)9( th)7(e )]TJ
/F11 1 Tf
9 0 0 9 424.48 240.963 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 444.64 240.956 Tm
0.004 Tc
0.035 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 464.8 240.963 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 497.8 240.956 Tm
-0.002 Tc
0.041 Tw
[( b)-8(u)4(tto)-8(ns m)17(eans)]TJ
-18.0602 -1.1807 TD
0 Tc
0.027 Tw
[(that they)18( w)23(ill b)-6(e)-2( kep)-6(t)1( o)-6(n)6( the d)-6(i)1(sp)-6(lay)18(,)-3( w)23(h)6(ere they)18( )-12(serve )-12(as )-12(an)]TJ
T*
0.003 Tw
[(easily)18( activated)-6( m)19(e)-2(tho)-6(d)-6( f)8(o)-6(r p)-6(a)-2(ge revisitatio)-6(n.)]TJ
/F3 1 Tf
9 0 0 9 317.92 194.403 Tm
0.002 Tc
0 Tw
[(2.4 )-320(Recognition instead of Decision Making)]TJ
/F11 1 Tf
0 -1.28 TD
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 338.08 182.876 Tm
0.004 Tc
0.047 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 358.48 182.883 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 391.48 182.876 Tm
0.005 Tc
0.058 Tw
[( )12(w)28(o)-1(rk)11( )12(by)23( di)6(s)8(p)-1(l)6(a)3(y)23(i)6(n)11(g)11( t)6(h)11(e appropri)6(a)3(t)6(e)3( pag)11(e)]TJ
-7.3855 -1.1807 TD
0.003 Tc
0.096 Tw
[(in)9( )12(th)9(e )12(brow)26(ser w)26(i)4(n)9(dow)26(. In)9( com)22(m)22(o)-3(n)9( u)9(s)6(e, on)9(e m)22(e)1(rely)21( k)9(eeps)]TJ
T*
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[(First, th)8(ere are m)21(a)0(n)8(y)20( cases w)25(h)8(ere )-12(people )-12(do )-12(w)25(a)0(n)8(t)3( )-12(to )-12(rev)8(i)3(sit)]TJ
0 -1.1807 TD
0.037 Tw
[(pag)8(e)0(s )12(seen)8( )12(on)8( an)8( old \(an)8(d)-4( n)8(o)-4(w)25( n)8(o)-4( lon)8(g)8(e)0(r av)8(ailable\) bran)8(ch)8(.)]TJ
T*
0.061 Tw
[(Usin)8(g)8( th)8(e ex)8(am)21(ple abov)8(e, if)10( a person)8( w)25(a)0(n)8(t)3(ed to g)8(o)-4( back)8( to)]TJ
T*
0.004 Tc
[(pag)10(e)2( )]TJ
/F9 1 Tf
2.1928 -0.001 TD
0.002 Tc
(e )Tj
/F7 1 Tf
0.747 0.001 TD
0.005 Tc
0.046 Tw
[(f)13(r)1(om)24( pag)11(e)3( )]TJ
/F9 1 Tf
4.4217 -0.001 TD
0 Tc
0 Tw
(i)Tj
/F7 1 Tf
0.2771 0.001 TD
-0.004 Tc
0.055 Tw
[(,)-7( the)-6(y)14( c)-6(o)-10(uld)-10( no)-10( lo)-10(nge)-6(r)-8( d)-10(o)-10( it via)-6( the)-6( )]TJ
/F11 1 Tf
9 0 0 9 274 500.523 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 54.04 488.756 Tm
0.004 Tc
-0.001 Tw
[(bu)10(t)5(t)5(o)-2(n)10( as)7( pag)10(e)2( )]TJ
/F9 1 Tf
6.0361 0 TD
0 Tc
0 Tw
(e)Tj
/F7 1 Tf
0.4458 0 TD
-0.001 Tc
0.004 Tw
[( has b)-7(een p)-7(r)-5(uned)-7( o)-7(f)7(f)7( the list.)]TJ
-6.4819 -1.7831 TD
0.002 Tc
0.302 Tw
[(Nex)8(t)3(, w)25(e)0( cou)8(l)3(d arg)8(u)8(e)0( th)8(at th)8(e )]TJ
/F11 1 Tf
9 0 0 9 191.68 471.003 Tm
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 211.84 470.996 Tm
-0.002 Tc
0.306 Tw
[( b)-8(u)4(tto)-8(n )-12(isn\222)6(t )-12(really)]TJ
-15.8434 -1.1807 TD
0.002 Tc
0.025 Tw
[(requ)8(ired f)10(o)-4(r th)8(is case, becau)8(se th)8(e person)8( can)8( f)10(i)3(rst u)8(s)5(e )]TJ
/F11 1 Tf
9 0 0 9 274 459.243 Tm
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 54.04 446.876 Tm
-0.004 Tc
0.091 Tw
[(to)-10( go)-10( )-12(f)4(r)-8(o)-10(m)15( )]TJ
/F9 1 Tf
4.747 0 TD
0 Tc
0 Tw
(i)Tj
/F12 1 Tf
9.96 0 2.117 9.96 104.084 446.88 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 113.92 446.866 Tm
(c)Tj
/F7 1 Tf
0.4458 0 TD
-0.004 Tc
0.103 Tw
[(,)-7( a)-6(n)2(d)-10( the)-6(n)2( use)-6( the)-6( no)-10(r)-8(m)15(a)-6(l)-3( links to)-10( na)-6(viga)-6(te)]TJ
/F9 1 Tf
-6.4578 -1.242 TD
0 Tc
0 Tw
(c)Tj
/F12 1 Tf
9.96 0 2.117 9.96 58.484 434.52 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 68.32 434.506 Tm
(d)Tj
/F12 1 Tf
9.96 0 2.117 9.96 73.364 434.52 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 83.2 434.506 Tm
0.003 Tc
(e. )Tj
/F7 1 Tf
1.0843 0.001 TD
-0.001 Tc
0.149 Tw
[(W)-9(h)5(ile )12(reaso)-7(n)5(ab)-7(le f)7(o)-7(r sho)-7(r)-5(t p)-7(a)-3(ges w)22(ith f)7(e)-3(w)22( links)]TJ
-4.012 -1.1807 TD
0.04 Tw
[(and)-7( )12(sho)-7(r)-5(t )12(navigatio)-7(nal )12(p)-7(a)-3(ths, )12(this co)-7(uld)-7( b)-7(eco)-7(m)18(e)-3( o)-7(n)5(ero)-7(u)5(s f)7(o)-7(r)]TJ
T*
-0.002 Tc
0.306 Tw
[(m)17(o)-8(re co)-8(m)17(p)-8(lex situatio)-8(ns. So)-8(m)17(e)-4( p)-8(a)-4(ges can b)-8(e)-4( )-12(lo)-8(ng )-12(and)]TJ
T*
0.162 Tw
[(co)-8(m)17(p)-8(lex: recalling and)-8( f)6(i)-1(nd)-8(ing the co)-8(rrect link )-12(w)21(ithin )-12(the)]TJ
T*
0.004 Tc
0.095 Tw
[(pag)10(e)2( cou)10(l)5(d be di)5(f)12(f)12(i)5(cu)10(l)5(t)5(.)1( S)6(i)5(m)23(i)5(l)5(a)2(rl)5(y)22(,)1( i)5(f)12( t)5(h)10(e pers)7(on)10( f)12(o)-2(l)5(l)5(o)-2(w)27(e)2(d )-12(a)]TJ
T*
-0.001 Tc
0.221 Tw
[(co)-7(m)18(p)-7(lex navigatio)-7(nal p)-7(a)-3(th to)-7( get to)-7( a p)-7(a)-3(rticular )-12(p)-7(a)-3(ge, )-12(it)]TJ
T*
0.002 Tc
0.17 Tw
[(cou)8(l)3(d be ch)8(allen)8(g)8(i)3(n)8(g)8( to rem)21(e)0(m)21(b)-4(er an)8(d/or recon)8(s)5(tru)8(c)0(t )-12(th)8(at)]TJ
T*
0.001 Tc
0.002 Tw
[(p)-5(a)-1(th later o)-5(n)7(.)]TJ
0 -1.7831 TD
0.004 Tc
0.023 Tw
[(T)-11(h)10(i)5(r)0(d, an)10(d as)7( di)5(s)7(c)2(u)10(s)7(s)7(e)2(d i)5(n)10( S)6(ect)5(i)5(o)-2(n)10( 2.2, cu)10(rren)10(t)5( )-12(s)7(y)22(s)7(t)5(em)23(s)7( )-12(do )-12(a)]TJ
0 -1.1807 TD
0.005 Tc
0.167 Tw
[(poor job of)13( com)24(m)24(u)11(n)11(i)6(cat)6(i)6(n)11(g)11( t)6(h)11(e t)6(r)1(ee-)13(pru)11(n)11(i)6(n)11(g)11( )-13(beh)11(a)3(v)11(i)6(ou)11(r )-12(of)]TJ
T*
0.004 Tc
0.011 Tw
[(t)5(h)10(e )12(s)7(t)5(ack)10( )12(t)5(o)-2( )12(i)5(t)5(s)7( )12(u)10(s)7(ers)7( \(C)8(ock)10(b)-2(u)10(r)0(n)10( an)10(d Jon)10(e)2(s)7( 1996\). T)-11(h)10(e l)5(a)2(bel)5(s)]TJ
/F11 1 Tf
9 0 0 9 54.04 299.163 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 74.2 299.156 Tm
0.004 Tc
0.035 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 94.36 299.163 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 127.36 299.156 Tm
0.037 Tw
[( h)8(a)0(v)8(e)0( af)10(f)10(o)-4(rdan)8(ces of)10( lin)8(earity)20(, )-12(rath)8(er )-12(th)8(an)]TJ
-7.3614 -1.1807 TD
0.097 Tw
[(of)10( a tree. T)-13(h)8(ere are f)10(e)0(w)25( cu)8(es )-12(at )-12(th)8(e )-12(in)8(terf)10(ace )-12(to )-12(h)8(e)0(lp )-12(u)8(s)5(ers)]TJ
T*
-0.004 Tc
0.465 Tw
[(d)-10(i)-3(stinguish b)-10(e)-6(tw)19(e)-6(e)-6(n)2( the)-6( und)-10(e)-6(r)-8(ly)14(ing se)-6(m)15(a)-6(ntic)-6(s o)-10(f)4( )-12(p)-10(a)-6(ge)]TJ
T*
0.004 Tc
0.107 Tw
[(di)5(s)7(p)-2(l)5(a)2(y)22( u)10(s)7(i)5(n)10(g)10( l)5(i)5(n)10(k)10( s)7(e)2(l)5(ect)5(i)5(o)-2(n)10( \(poppi)5(n)10(g)10( t)5(h)10(e )-12(s)7(t)5(ack)10( )-12(an)10(d )-12(addi)5(n)10(g)]TJ
T*
-0.001 Tc
0.1 Tw
[(to)-7( the new)22( stack-)7(t)0(o)-7(p)-7(\))-5( versus the )-12(sem)18(a)-3(ntics )-12(o)-7(f)7( )-12(p)-7(a)-3(ge )-12(d)-7(i)0(sp)-7(lay)]TJ
T*
-0.004 Tc
0.236 Tw
[(using the)-6( )]TJ
/F11 1 Tf
9 0 0 9 97.12 240.363 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 117.28 240.356 Tm
0.004 Tc
0.24 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 141.52 240.363 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 174.52 240.356 Tm
-0.003 Tc
0.247 Tw
[( b)-9(u)3(tto)-9(ns \(m)16(o)-9(v)3(ing w)20(ithin the)]TJ
-12.0964 -1.1807 TD
0.001 Tc
0.388 Tw
[(stack)7(\). )13(It )13(is n)7(o)-5(t su)7(rprisin)7(g)7(,)-2( th)7(eref)9(ore, th)7(at m)20(a)-1(n)7(y)19( u)7(s)4(ers)]TJ
T*
0.004 Tc
0.107 Tw
[(peri)5(odi)5(cal)5(l)5(y)22( f)12(i)5(n)10(d)-2( t)5(h)10(at)5( t)5(h)10(ey)22( h)10(a)2(v)10(e)2( \221)12(l)5(os)7(t)5(\222)12( )-12(pag)10(e)2(s)7( )-12(on)10( )-12(t)5(h)10(e )-12(h)10(i)5(s)7(t)5(ory)]TJ
T*
-0.001 Tc
[(\221)7(list\222)7(.)]TJ
0 -1.7831 TD
0.002 Tc
0.001 Tw
[(Su)8(m)21(m)21(a)0(risin)8(g)8( th)8(e pros an)8(d con)8(s)5( of)10( stack)8(-)10(b)-4(ased n)8(a)0(v)8(i)3(g)8(a)0(tion)8(:)]TJ
/F13 1 Tf
0 -1.3005 TD
0 Tc
0 Tw
(4)Tj
/F11 1 Tf
0.8434 -0.0017 TD
( )Tj
/F7 1 Tf
0.5181 0 TD
0.001 Tc
0.038 Tw
[(It )12(im)20(plem)20(en)7(ts a \221)9(s)4(im)20(ple\222)9( in)7(terf)9(ace th)7(at requ)7(ires on)7(ly)19( tw)24(o)]TJ
0 -1.1807 TD
-0.002 Tc
0.005 Tw
[(b)-8(u)4(tto)-8(ns \()]TJ
/F11 1 Tf
9 0 0 9 102.76 162.603 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 122.92 162.596 Tm
0.004 Tc
-0.001 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 142.36 162.603 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 175.36 162.596 Tm
0.004 Tc
(\).)Tj
/F13 1 Tf
-12.1807 -1.3005 TD
0 Tc
0 Tw
(4)Tj
/F11 1 Tf
0.8434 -0.0017 TD
( )Tj
/F7 1 Tf
0.5181 0.001 TD
0.002 Tc
0.182 Tw
[(T)-13(h)8(e au)8(tom)21(a)0(tic pru)8(n)8(i)3(n)8(g)8( of)10( th)8(e stack)8( )-12(of)10( )-12(prev)8(iou)8(s)5( )-12(pag)8(e)0(s)]TJ
0 -1.1807 TD
0.314 Tw
[(m)21(a)0(y)20( )12(rem)21(o)-4(v)8(e)0( bran)8(ch)8(es an)8(d pag)8(e)0(s th)8(at are n)8(o)-4( lon)8(g)8(e)0(r)]TJ
T*
0.001 Tw
[(n)8(eeded \(as w)25(h)8(en)8( people j)-9(u)8(st w)25(a)0(n)8(t)3( to m)21(o)-4(v)8(e)0( \221)10(u)8(p\222)10( th)8(e tree\).)]TJ
/F13 1 Tf
-1.3614 -1.3005 TD
0 Tc
0 Tw
(4)Tj
/F11 1 Tf
0.8434 -0.0017 TD
( )Tj
/F7 1 Tf
0.5181 0.001 TD
0.001 Tc
0.544 Tw
[(P)-9(e)-1(ople are able to u)7(s)4(e it ev)7(en)7( w)24(ith)7( )-12(in)7(com)20(p)-5(lete)]TJ
0 -1.1807 TD
-0.005 Tc
[(und)-11(e)-7(r)-9(sta)-7(n)1(d)-11(i)-4(ng.)]TJ
/F13 1 Tf
-1.3614 -1.3005 TD
0 Tc
0 Tw
(7)Tj
/F11 1 Tf
0.5663 -0.0017 TD
( )Tj
/F7 1 Tf
0.7952 0 TD
0.004 Tc
0.071 Tw
[(Us)7(ers)7( can)10(n)10(o)-2(t)5( ret)5(u)10(rn)10( t)5(o)-2( pag)10(e)2(s)7( t)5(h)10(at)5( h)10(a)2(v)10(e)2( )-12(been)10( )-12(popped )-12(of)12(f)]TJ
0 -1.1807 TD
0 Tc
0.003 Tw
[(th)6(e stack)6(.)]TJ
/F13 1 Tf
25.1325 40.0609 TD
0 Tw
(7)Tj
/F11 1 Tf
0.5663 -0.0017 TD
( )Tj
/F7 1 Tf
0.7952 0 TD
0.004 Tc
0.047 Tw
[(T)-11(h)10(e m)23(odel)5( i)5(s)7( poorl)5(y)22( com)23(m)23(u)10(n)10(i)5(cat)5(ed t)5(o)-2( u)10(s)7(ers)7( t)5(h)10(ro)]TJ
19.7452 0 TD
-0.005 Tc
0.056 Tw
(ugh the)Tj
-19.7452 -1.1807 TD
0.002 Tc
0.459 Tw
[(in)8(terf)10(ace. C)6(o)-4(n)8(s)5(equ)8(e)0(n)8(tly)20(, people are su)8(rprised w)25(h)8(en)]TJ
T*
0.004 Tc
-0.001 Tw
[(pag)10(e)2(s)7( \221)12(d)-2(i)5(s)7(appear\222)12(.)]TJ
/F13 1 Tf
-1.3614 -1.3005 TD
0 Tc
0 Tw
(7)Tj
/F11 1 Tf
0.5663 -0.0017 TD
( )Tj
/F7 1 Tf
0.7952 0 TD
0.005 Tc
0.167 Tw
[(It)6( )12(i)6(n)11(t)6(r)1(odu)11(ces)8( )12(t)6(w)28(o )12(di)6(f)13(f)13(e)3(ren)11(t)6( s)8(e)3(m)24(a)3(n)11(t)6(i)6(c)3(s)8( f)13(o)-1(r pag)11(e)3( di)6(s)8(p)-1(l)6(a)3(y)23(:)]TJ
0 -1.1807 TD
0.004 Tc
0.264 Tw
[(l)5(i)5(n)10(k)10(-)12(s)7(e)2(l)5(ect)5(i)5(o)-2(n)10( w)27(h)10(i)5(c)2(h)10( pops)7( i)5(t)5(e)2(m)23(s)7( of)12(f)12( t)5(h)10(e s)7(t)5(ack)10(, bef)12(o)-2(re)]TJ
T*
0.445 Tw
[(addi)5(n)10(g)10( t)5(h)10(e n)10(e)2(w)27( pag)10(e)2( t)5(o)-2( t)5(h)10(e s)7(t)5(ack)10( )-12(t)5(op;)5( )-12(an)10(d )-12(pag)10(e)]TJ
T*
-0.002 Tc
0.535 Tw
[(revisitatio)-8(n w)21(ith )]TJ
/F11 1 Tf
9 0 0 9 409.24 403.923 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 442.24 403.916 Tm
0.004 Tc
0.529 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 472.24 403.923 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 492.4 403.916 Tm
-0.004 Tc
0.549 Tw
[( w)19(h)2(ic)-6(h m)15(o)-10(ve)-6(s)]TJ
-16.1566 -1.1807 TD
-0.003 Tc
0.235 Tw
[(thr)-7(o)-9(ugh the)-5( sta)-5(c)-5(k)3( o)-9(f)5( p)-9(r)-7(e)-5(v)3(io)-9(usly)15( visite)-5(d)-9( p)-9(a)-5(ge)-5(s )-12(w)20(itho)-9(u)3(t)]TJ
T*
-0.001 Tc
0.004 Tw
(altering it.)Tj
/F3 1 Tf
9 0 0 9 317.92 357.363 Tm
0.003 Tw
[(4)-5(.)-3( )-880(PURE RECENCY-BA)14(SED BEHA)14(VIOR)]TJ
/F7 1 Tf
9.96 0 0 9.96 317.92 345.836 Tm
0.001 Tc
0.026 Tw
[(P)-9(e)-1(rh)7(aps th)7(e g)7(r)-3(eatest disadv)7(an)7(tag)7(e)-1( of)9( )-12(stack)7(-)9(b)-5(ased )-12(n)7(a)-1(v)7(i)2(g)7(a)-1(tion)]TJ
T*
-0.001 Tc
0.076 Tw
[(is that it d)-7(o)-7(e)-3(s no)-7(t p)-7(r)-5(o)-7(v)5(id)-7(e a )-12(co)-7(m)18(p)-7(lete )-12(histo)-7(r)-5(y)17( )-12(o)-7(f)7( )-12(p)-7(r)-5(evio)-7(usly)]TJ
T*
0.438 Tw
[(visited)-7( p)-7(a)-3(ges. A)10(s)2( an alternative, w)22(e)-3( co)-7(uld)-7( )-12(p)-7(r)-5(o)-7(v)5(id)-7(e )-12(a)]TJ
T*
-0.003 Tc
0.331 Tw
[(c)-5(o)-9(m)16(p)-9(le)-5(te)-5( )12(histo)-9(r)-7(y)15( )12(o)-9(f)5( p)-9(r)-7(e)-5(v)3(io)-9(usly)15( visite)-5(d)-9( p)-9(a)-5(ge)-5(s b)-9(y)15( ha)-5(ving)]TJ
/F11 1 Tf
9 0 0 9 317.92 298.803 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 338.08 298.796 Tm
0.004 Tc
0.083 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 359.2 298.803 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 392.2 298.796 Tm
-0.001 Tc
0.1 Tw
[( )12(m)18(o)-7(ve )12(a p)-7(e)-3(r)-5(s)2(o)-7(n)5( thr)-5(o)-7(ugh a r)-5(ecency)17(-)7(b)-7(ased)]TJ
-7.4578 -1.1807 TD
-0.003 Tc
0.114 Tw
[(histo)-9(r)-7(y)15( list,)-6( w)20(h)3(e)-5(r)-7(e)-5( the)-5( b)-9(u)3(tto)-9(ns sim)16(p)-9(ly)15( )-12(na)-5(viga)-5(te)-5( )-12(thr)-7(o)-9(ugh )-12(the)]TJ
T*
0.003 Tc
0.048 Tw
[(pag)9(e)1(s)6( in)9( rev)9(e)1(rs)6(e order to h)9(o)-3(w)26( th)9(ey)21( w)26(e)1(re )-12(s)6(een)9(. )-12(S)5(u)9(rpris)6(i)4(n)9(g)9(l)4(y)21(,)]TJ
T*
0.001 Tc
0.098 Tw
[(th)7(e desig)7(n)7( of)9( a bu)7(tton)7( in)7(terf)9(ace to com)20(p)-5(lete h)7(i)2(story)19( lists is)]TJ
T*
-0.004 Tc
0.043 Tw
[(no)-10(t )12(a)-6(s)-1( )12(sim)15(p)-10(le)-6( )12(a)-6(s)-1( )12(m)15(i)-3(ght b)-10(e)-6( e)-6(x)2(p)-10(e)-6(c)-6(t)-3(e)-6(d)-10(.)-7( Altho)-10(ugh fo)-10(r)-8(m)15(ing a)-6( list)]TJ
T*
-0.002 Tc
0.138 Tw
[(o)-8(f)6( all o)-8(f)6( the p)-8(a)-4(ges that a user visits is trivial, d)-8(e)-4(signing )-12(a)]TJ
T*
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[(T)-17(h)4(e histo)-8(r)-6(y)16( list w)21(ill no)-8(w)21( b)-8(e)-4( {)]TJ
/F9 1 Tf
12.2289 0 TD
0.004 Tc
0.083 Tw
(a b,c,d,c)Tj
/F7 1 Tf
3.506 0 TD
0.001 Tc
0.086 Tw
[(}, as )]TJ
/F9 1 Tf
2.241 0 TD
0 Tc
0 Tw
(c)Tj
/F7 1 Tf
0.4458 0 TD
-0.001 Tc
0.088 Tw
[( has j)-12(u)5(st )-12(b)-7(een)]TJ
-18.4217 -1.1807 TD
-0.002 Tc
0.077 Tw
[(visited)-8(.)-5( W)-10(h)4(en )]TJ
/F11 1 Tf
9 0 0 9 113.32 692.163 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 133.48 692.156 Tm
-0.001 Tc
0.088 Tw
[( is clicked)-7( again, the resulting actio)-7(n is)]TJ
/F9 1 Tf
-7.9759 -1.242 TD
0 Tc
0 Tw
(c)Tj
/F12 1 Tf
9.96 0 2.117 9.96 58.484 679.8 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 68.32 679.786 Tm
(d)Tj
/F7 1 Tf
0.506 0 TD
0.002 Tc
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[( rath)8(er th)8(an)8( th)8(e ex)8(pected )]TJ
/F9 1 Tf
12.1446 0 TD
0 Tc
0 Tw
(c)Tj
/F12 1 Tf
9.96 0 2.117 9.96 198.764 679.8 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 208.6 679.786 Tm
(b)Tj
/F7 1 Tf
0.506 0 TD
-0.001 Tc
0.426 Tw
[(. )12(T)-16(h)5(e list is no)-7(w)]TJ
-16.0241 -1.1807 TD
0 Tc
0 Tw
({)Tj
/F9 1 Tf
0.4819 0 TD
0.004 Tc
(a,b,c,d,c,d)Tj
/F7 1 Tf
4.1807 0 TD
-0.004 Tc
0.441 Tw
[(})-6(.)-7( Sub)-10(s)-1(e)-6(q)-10(ue)-6(nt c)-6(lic)-6(ks o)-10(f)4( )]TJ
/F11 1 Tf
9 0 0 9 212.44 668.043 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 232.6 668.036 Tm
0 Tc
0.449 Tw
[( sim)19(p)-6(ly)18( cy)18(cle)]TJ
-17.9277 -1.1807 TD
0.003 Tc
0 Tw
[(bet)4(w)26(een)9( pag)9(e)1(s)6( )]TJ
/F9 1 Tf
6.0964 0 TD
0 Tc
(d)Tj
/F7 1 Tf
0.506 0 TD
0.004 Tc
-0.001 Tw
[( an)10(d )]TJ
/F9 1 Tf
1.9518 0 TD
0 Tc
0 Tw
(c)Tj
/F7 1 Tf
0.4458 0 TD
(.)Tj
-9 -1.7831 TD
0.001 Tc
0.098 Tw
[(T)-14(h)7(e cau)7(se of)9( th)7(is problem)20( is th)7(at )-12(w)24(e)-1( )-12(are )-12(treatin)7(g)7( )-12(th)7(e )]TJ
/F11 1 Tf
9 0 0 9 274 638.523 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 54.04 626.756 Tm
0.158 Tw
[(action)8( as a n)8(o)-4(rm)21(al n)8(a)0(v)8(i)3(g)8(a)0(tion)8(a)0(l act th)8(at adds )-12(back)8(track)8(ed)]TJ
0 -1.1807 TD
0.005 Tc
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[(pag)11(e)3(s)8( t)6(o)-1( t)6(h)11(e h)11(i)6(s)8(t)6(ory)23( l)6(i)6(s)8(t)6(.)2( T)-10(h)11(i)6(s)8( w)28(o)-1(u)11(l)6(d be g)11(ood i)6(f)13( i)6(t)6( w)28(o)-1(rk)11(ed.)]TJ
T*
-0.001 Tc
0.257 Tw
[(Since it d)-7(o)-7(e)-3(s no)-7(t, w)22(e)-3( have to)-7( treat )]TJ
/F11 1 Tf
9 0 0 9 211.24 603.243 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 231.4 603.236 Tm
-0.008 Tc
0.264 Tw
[( d)-14(i)-7(ffe)-10(r)-12(e)-10(nt)-7(l)-7(y)10(,)-11( )-12(a)-10(s)]TJ
-17.8072 -1.1807 TD
-0.002 Tc
0.005 Tw
[(d)-8(i)-1(scussed)-8( in the f)6(o)-8(llo)-8(w)21(i)-1(ng sub)-8(-)6(sectio)-8(ns.)]TJ
0 -1.7831 TD
0.004 Tc
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[(A)15(s)7( a s)7(i)5(de di)5(s)7(c)2(u)10(s)7(s)7(i)5(on)10(, t)5(h)10(e m)23(a)2(n)10(a)2(g)10(e)2(m)23(e)2(n)10(t)5( )-12(of)12( )-12(du)10(pl)5(i)5(cat)5(e )-12(en)10(t)5(r)0(i)5(e)2(s)7( )-12(i)5(n)]TJ
0 -1.1807 TD
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0.053 Tw
[(the histo)-8(r)-6(y)16( list is an issue that m)17(u)4(st b)-8(e)-4( ad)-8(d)-8(r)-6(essed)-8(.)-5( A)9(llo)-8(w)21(i)-1(ng)]TJ
T*
0 Tc
0.208 Tw
[(d)-6(u)6(p)-6(licate )12(p)-6(a)-2(ges )12(m)19(eans )12(that )12(the sy)18(stem)19( can o)-6(f)8(f)8(e)-2(r a literal)]TJ
T*
0.002 Tc
0.085 Tw
[(represen)8(tation)8( of)10( th)8(e order of)10( pag)8(e)0(s th)8(at )-12(th)8(e )-12(u)8(s)5(er )-12(h)8(a)0(s )-12(seen)8(.)]TJ
T*
-0.001 Tc
0.811 Tw
[(T)-16(h)5(e )12(d)-7(i)0(sad)-7(v)5(antage )12(is that the list co)-7(uld)-7( b)-7(eco)-7(m)18(e)]TJ
T*
-0.003 Tc
0.379 Tw
[(unne)-5(c)-5(e)-5(ssa)-5(r)-7(ily)15( )12(lo)-9(ng )12(a)-5(n)3(d)-9( r)-7(e)-5(p)-9(e)-5(titio)-9(us.)-6( I)-7(n)3(ste)-5(a)-5(d)-9(,)-6( w)20(e)-5( sugge)-5(st)]TJ
T*
0.004 Tc
0.047 Tw
[(pru)10(n)10(i)5(n)10(g)10( du)10(pl)5(i)5(cat)5(e pag)10(e)2(s)7( by)22( k)10(eepi)5(n)10(g)10( on)10(l)5(y)22( a s)7(i)5(n)10(g)10(l)5(e copy)22( of)12( i)5(t)]TJ
T*
0 Tc
0.136 Tw
[(in)6( )13(its m)19(o)-6(st recen)6(t p)-6(o)-6(s)3(itio)-6(n)6( o)-6(n)6( th)6(e list: th)6(is k)6(eep)-6(s recen)6(tly)18(-)]TJ
T*
0.002 Tc
0.399 Tw
[(rev)8(i)3(sited pag)8(e)0(s n)8(ear th)8(e top. T)-13(a)0(u)8(s)5(ch)8(er an)8(d Green)8(berg)]TJ
T*
0.004 Tc
0.264 Tw
[(\(1997\) an)10(al)5(y)22(zed t)5(h)10(i)5(s)7(, an)10(d f)12(o)-2(u)10(n)10(d)-2( t)5(h)10(at)5( s)7(u)10(bs)7(t)5(a)2(n)10(t)5(i)5(a)2(l)5(l)5(y)22( )-12(f)12(e)2(w)27(e)2(r)]TJ
/F11 1 Tf
9 0 0 9 54.04 456.123 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 74.2 456.116 Tm
0.004 Tc
0.071 Tw
[( )12(pres)7(s)7(e)2(s)7( )12(w)27(o)-2(u)10(l)5(d )12(be requ)10(i)5(r)0(ed t)5(o)-2( ret)5(u)10(rn)10( t)5(o)-2( a des)7(i)5(red pag)10(e)]TJ
-2.0241 -1.1807 TD
0.002 Tc
0.387 Tw
[(w)25(h)8(en)8( du)8(plicates are pru)8(n)8(e)0(d. For ex)8(am)21(ple, )-12(if)10( )-12(th)8(e )-12(u)8(s)5(er)]TJ
0 -1.241 TD
-0.004 Tc
0.646 Tw
[(na)-6(viga)-6(te)-6(s thr)-8(o)-10(ugh p)-10(a)-6(ge)-6(s )]TJ
/F9 1 Tf
11.8072 0 TD
0 Tc
0 Tw
(z)Tj
/F12 1 Tf
9.96 0 2.117 9.96 175.484 432 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 185.32 431.986 Tm
(a)Tj
/F12 1 Tf
9.96 0 2.117 9.96 190.364 432 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 200.2 431.986 Tm
(b)Tj
/F12 1 Tf
9.96 0 2.117 9.96 205.244 432 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 215.08 431.986 Tm
(c)Tj
/F12 1 Tf
9.96 0 2.117 9.96 219.524 432 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 229.36 431.986 Tm
(b)Tj
/F12 1 Tf
9.96 0 2.117 9.96 234.404 432 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 244.24 431.986 Tm
0.006 Tc
(a,)Tj
/F7 1 Tf
0.759 0 TD
0.001 Tc
0.653 Tw
[( a strict)]TJ
-19.8554 -1.1807 TD
-0.002 Tc
0.138 Tw
[(seq)-8(u)4(ential )13(histo)-8(r)-6(y)16( list w)21(o)-8(uld)-8( co)-8(ntain {)]TJ
/F9 1 Tf
15.8434 -0.001 TD
0.004 Tc
[(z)7(,)1(a,b,c,b,a)]TJ
/F7 1 Tf
4.1205 0.001 TD
0.001 Tc
0.135 Tw
[(}, w)24(h)7(ile a)]TJ
-19.9639 -1.1807 TD
-0.001 Tc
0.197 Tw
[(seq)-7(u)5(ential histo)-7(r)-5(y)17( list w)22(ith d)-7(u)5(p)-7(licates retained)-7( o)-7(n)5(ly)17( in )-12(its)]TJ
T*
-0.002 Tc
0.029 Tw
[(last p)-8(o)-8(s)1(itio)-8(n w)21(o)-8(uld)-8( b)-8(e)-4( {)]TJ
/F9 1 Tf
9.6386 0 TD
-0.001 Tc
[(z,)-4(c,)-4(b)-7(,)-4(a)]TJ
/F7 1 Tf
2.6024 0 TD
0.002 Tc
0.025 Tw
[(}: back)8(track)8(in)8(g)8( to )]TJ
/F9 1 Tf
7.5301 0 TD
-0.003 Tc
(z )Tj
/F7 1 Tf
0.6747 0 TD
0 Tc
0.039 Tw
[(is clearly)]TJ
-20.4458 -1.1807 TD
0.051 Tw
[(q)-6(u)6(icker )12(in )12(the )12(later )12(case. Ind)-6(eed)-6(, this later schem)19(e)-2( has b)-6(een)]TJ
T*
-0.001 Tc
0.064 Tw
[(taken up)-7( b)-7(y)17( so)-7(m)18(e)-3( co)-7(m)18(m)18(e)-3(rcial b)-7(r)-5(o)-7(w)22(sers: Netscap)-7(e 4)-7( )-12(uses )-12(it)]TJ
T*
-0.002 Tc
0.451 Tw
[(in their histo)-8(r)-6(y)16( w)21(i)-1(nd)-8(o)-8(w)21( \(b)-8(ut no)-8(t w)21(ith )]TJ
/F11 1 Tf
9 0 0 9 234.04 361.443 Tm
0.007 Tc
[(B)7(a)3(ck\))]TJ
/F7 1 Tf
9.96 0 0 9.96 257.2 361.436 Tm
0.002 Tc
0.459 Tw
[(. )12(In)8( th)8(e)]TJ
-20.3976 -1.1807 TD
0.001 Tc
0.014 Tw
[(rem)20(a)-1(in)7(d)-5(e)-1(r o)-5(f)9( th)7(is p)-5(a)-1(p)-5(e)-1(r, w)24(e)-1( w)24(ill u)7(s)4(e recen)7(cy)19( w)24(ith)7( )-12(d)-5(u)7(p)-5(licates)]TJ
T*
-0.005 Tc
0.454 Tw
[(r)-9(e)-7(m)14(o)-11(ve)-7(d)-11(.)-8( U)-6(n)1(fo)-11(r)-9(t)-4(una)-7(te)-7(ly)13(,)-8( r)-9(e)-7(m)14(o)-11(ving d)-11(u)1(p)-11(lic)-7(a)-7(t)-4(e)-7(s)-2( )-12(fr)-9(o)-11(m)14( )-12(the)]TJ
T*
0.004 Tc
0.348 Tw
[(h)10(i)5(s)7(t)5(ory)22( )12(l)5(i)5(s)7(t)5( )12(does)7( )12(n)10(o)-2(t)5( )12(ov)10(ercom)23(e)2( t)5(h)10(e probl)5(em)23( of)12( cy)22(cl)5(i)5(n)10(g)]TJ
T*
-0.001 Tc
0.004 Tw
[(b)-7(e)-3(tw)22(een the last tw)22(o)-7( p)-7(a)-3(ges o)-7(n)5( the list.)]TJ
/F3 1 Tf
9 0 0 9 54.04 291.363 Tm
0.003 Tc
-0.001 Tw
[(4.2 )-320(Recency)52(:)16( A)18(dding Spokes O)8(nly)]TJ
/F7 1 Tf
9.96 0 0 9.96 54.04 279.836 Tm
0.337 Tw
[(W)-5(e)1( can)9( )-12(m)22(odif)11(y)21( )]TJ
/F11 1 Tf
9 0 0 9 128.08 279.843 Tm
0.007 Tc
[(B)7(a)3(ck )]TJ
/F7 1 Tf
9.96 0 0 9.96 154.24 279.836 Tm
0.004 Tc
[(an)10(d )]TJ
/F11 1 Tf
9 0 0 9 174.64 279.843 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 207.64 279.836 Tm
-0.004 Tc
0.356 Tw
[( to)-10( m)15(o)-10(ve)-6( a)-6( p)-10(o)-10(i)-3(nte)-6(r)]TJ
-15.4217 -1.1807 TD
-0.003 Tc
0.331 Tw
[(thr)-7(o)-9(ugh )12(the)-5( histo)-9(r)-7(y)15( list.)-6( T)-18(h)3(is d)-9(i)-2(sp)-9(la)-5(y)15(s)0( the)-5( p)-9(a)-5(ge)-5( a)-5(t)-2( tha)-5(t)]TJ
T*
-0.001 Tc
0.137 Tw
[(lo)-7(catio)-7(n b)-7(u)5(t d)-7(o)-7(e)-3(s no)-7(t alter the list co)-7(ntents. Regard)-7(less o)-7(f)]TJ
T*
0.209 Tw
[(the )12(p)-7(o)-7(s)2(itio)-7(n )12(o)-7(f)7( the p)-7(o)-7(i)0(nter w)22(ithin the list, w)22(h)5(en the user)]TJ
T*
0.052 Tw
[(clicks )12(o)-7(n)5( )12(a )12(link )12(to)-7( )12(a new)22( p)-7(a)-3(ge, the p)-7(a)-3(ge is ad)-7(d)-7(e)-3(d)-7( to)-7( the end)]TJ
T*
0.002 Tc
0.158 Tw
[(of)10( )12(th)8(e )12(list )12(an)8(d )12(an)8(y)20( )12(elder du)8(plicates are rem)21(o)-4(v)8(e)0(d f)10(r)-2(om)21( th)8(e)]TJ
T*
-0.001 Tc
0.173 Tw
[(list. )12(W)-9(h)5(ile )12(sim)18(ilar )12(to)-7( )12(ho)-7(w)22( )12(a stack w)22(o)-7(rks, the f)7(act that no)]TJ
T*
0.004 Tc
0.023 Tw
[(pag)10(e)2(s)7( are \221)12(popped o)]TJ
8.1439 0 TD
-0.006 Tc
0.045 Tw
[(ff\222 )12(m)13(e)-8(a)-8(n)0(s )12(t)-5(h)0(a)-8(t)-5( a)-8(l)-5(l)-5( p)-12(r)-10(e)-8(v)0(i)-5(o)-12(usl)-5(y)12( se)-8(e)-8(n)0( p)-12(a)-8(ge)-8(s)]TJ
-8.1439 -1.1807 TD
0.002 Tc
0.001 Tw
[(are av)8(ailable v)8(i)3(a )]TJ
/F11 1 Tf
9 0 0 9 121.96 185.763 Tm
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 142.12 185.756 Tm
0 Tc
0 Tw
(.)Tj
-8.8434 -1.7831 TD
-0.001 Tc
0.197 Tw
[(Ho)-7(w)22(e)-3(ver, this schem)18(e)-3( is no)-7(t ef)7(f)7(i)0(cient f)7(o)-7(r )]TJ
/F9 1 Tf
17.8675 -0.001 TD
0.006 Tc
0.202 Tw
[(hub and s)9(poke)]TJ
/F7 1 Tf
-17.8675 -1.1797 TD
-0.004 Tc
0.091 Tw
[(na)-6(viga)-6(tio)-10(n.)-7( T)-19(o)-10( e)-6(x)2(p)-10(l)-3(a)-6(i)-3(n,)-7( p)-10(e)-6(o)-10(p)-10(l)-3(e)-6( o)-10(f)4(te)-6(n visit a)-6( c)-6(e)-6(n)2(tr)-8(a)-6(l)-3( p)-10(a)-6(ge)-6( \()-8(a)]TJ
0 -1.1807 TD
0.188 Tw
[(hub)-10(\))-8(,)-7( )12(na)-6(viga)-6(te)-6( )12(o)-10(n)2(e)-6( )12(o)-10(f)4( the)-6( m)15(a)-6(ny)14( links to)-10( a)-6( ne)-6(w)19( p)-10(a)-6(ge)-6( \()-8(t)-3(he)]TJ
T*
-0.001 Tc
0.137 Tw
[(sp)-7(o)-7(k)5(e\), return to)-7( the hub)-7(, go)-7( to)-7( the next sp)-7(o)-7(k)5(e )-12(and)-7( )-12(so)-7( )-12(o)-7(n)]TJ
T*
0.004 Tc
0.071 Tw
[(\(C)8(at)5(l)5(e)2(dg)10(e )12(an)10(d Pi)5(t)5(k)10(ow)27( 1995\). Ex)10(am)23(pl)5(e h)10(u)10(b)-2( pag)10(e)2(s)7( are h)10(o)-2(m)23(e)]TJ
T*
0.002 Tc
0.049 Tw
[(pag)8(e)0(s, tables of)10( con)8(t)3(en)8(ts, search)8( resu)8(lt lists, an)8(d )-12(so )-12(on)8(. )-12(T)-13(h)8(e)]TJ
T*
0.158 Tw
[(sch)8(e)0(m)21(e)0( )12(abov)8(e, )12(w)25(h)8(ile )12(adequ)8(a)0(te f)10(o)-4(r sim)21(p)-4(le back)8(track)8(in)8(g)8(,)-1( is)]TJ
T*
0.096 Tw
[(poor )12(f)11(o)-3(r h)9(u)9(b)-3( an)9(d s)6(pok)9(e n)9(a)1(v)9(i)4(g)9(a)1(tion)9( becau)9(s)6(e)1( th)9(e h)9(u)9(b)-3( m)22(o)-3(v)9(e)1(s)]TJ
26.494 64.5542 TD
0.049 Tw
[(f)10(u)8(rth)8(e)0(r )12(an)8(d )12(f)10(u)8(rth)8(e)0(r )12(aw)25(ay)20( )12(f)10(r)-2(om)21( th)8(e f)10(r)-2(on)8(t of)10( th)8(e list as spok)8(es)]TJ
0 -1.1807 TD
0.001 Tw
[(are v)8(i)3(sited.)]TJ
0 -1.7831 TD
0.158 Tw
[(C)6(o)-4(n)8(s)5(ider, f)10(o)-4(r ex)8(am)21(ple, th)8(e u)8(s)5(er action)8(s)5( ov)8(er th)8(e pag)8(e)0(s in)]TJ
0 -1.1807 TD
0.037 Tw
[(Fig)8(u)8(r)-2(e 1 w)25(h)8(ere th)8(ey)20( m)21(o)-4(v)8(e)0( sequ)8(en)8(tially)20( f)10(r)-2(om)21( )]TJ
/F9 1 Tf
18.1928 0 TD
0.006 Tc
(a )Tj
/F7 1 Tf
0.7952 0 TD
-0.003 Tc
0.042 Tw
[(to)-9( the hub)-9( )]TJ
/F9 1 Tf
4.3614 0 TD
0 Tc
0 Tw
(d)Tj
/F7 1 Tf
0.506 0 TD
(,)Tj
-23.8554 -1.1807 TD
0.004 Tc
0.095 Tw
[(an)10(d )12(t)5(h)10(en)10( h)10(u)10(b)-2(-)12(a)2(n)10(d)-2(-)12(s)7(pok)10(e brow)27(s)7(e)2( f)12(r)0(om)23( pag)10(e)2( )]TJ
/F9 1 Tf
17.8675 0 TD
0 Tc
0 Tw
(d)Tj
/F7 1 Tf
0.506 0 TD
0.002 Tc
0.097 Tw
[( to a series of)]TJ
-18.3735 -1.1807 TD
0.004 Tc
0.023 Tw
[(s)7(pok)10(e pag)10(e)2(s)7( )]TJ
/F9 1 Tf
5.1687 0 TD
0.002 Tc
0.025 Tw
[(e, f, g)]TJ
/F7 1 Tf
2.2892 0 TD
0.004 Tc
0.023 Tw
[( an)10(d )]TJ
/F9 1 Tf
2 0 TD
0 Tc
0 Tw
(h)Tj
/F7 1 Tf
0.506 0 TD
0.002 Tc
0.037 Tw
[(. A)13(f)10(ter arriv)8(i)3(n)8(g)8( at )]TJ
/F9 1 Tf
7.3855 0 TD
(e, )Tj
/F7 1 Tf
0.9879 0 TD
-0.002 Tc
0.041 Tw
[(the histo)-8(r)-6(y)16( list)]TJ
-18.3373 -1.1807 TD
0.029 Tw
[(is {)]TJ
/F9 1 Tf
1.4217 -0.001 TD
0.004 Tc
(a,b,c,d,e)Tj
/F7 1 Tf
3.4217 0.001 TD
0.003 Tc
0.024 Tw
[(}. T)-12(h)9(e pers)6(on)9( retu)9(rn)9(s)6( )-12(to )]TJ
/F9 1 Tf
9.9398 -0.001 TD
0 Tc
0 Tw
(d)Tj
/F7 1 Tf
0.506 0.001 TD
-0.004 Tc
0.043 Tw
[( b)-10(y)14( c)-6(lic)-6(king )]TJ
/F11 1 Tf
9 0 0 9 520.6 652.083 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 540.76 652.076 Tm
0.037 Tw
[( an)8(d)]TJ
-22.3735 -1.1807 TD
0.001 Tc
0.086 Tw
[(th)7(en)7( )12(selects th)7(e n)7(e)-1(x)7(t)2( spok)7(e lin)7(k)7( to )]TJ
/F9 1 Tf
14.3133 0 TD
0 Tc
0 Tw
(f)Tj
/F7 1 Tf
0.2771 0 TD
-0.002 Tc
0.089 Tw
[(: the histo)-8(r)-6(y)16( list is no)-8(w)]TJ
-14.5904 -1.1807 TD
0 Tc
0 Tw
({)Tj
/F9 1 Tf
0.4819 0 TD
0.004 Tc
(a,b,c,d,e,f)Tj
/F7 1 Tf
3.9518 0 TD
0.002 Tc
0.013 Tw
[(}. )12(T)-13(o)-4( v)8(i)3(sit spok)8(e )]TJ
/F9 1 Tf
6.9639 0 TD
0.005 Tc
(g, )Tj
/F7 1 Tf
1.0241 0 TD
-0.001 Tc
(the )Tj
/F11 1 Tf
9 0 0 9 456.4 628.563 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 476.56 628.556 Tm
-0.003 Tc
0.018 Tw
[( b)-9(u)3(tto)-9(n m)16(u)3(st no)-9(w)20( b)-9(e)]TJ
-15.9277 -1.1807 TD
-0.001 Tc
0.197 Tw
[(clicked)-7( tw)22(ice to)-7( return to)-7( the hub)-7( )]TJ
/F9 1 Tf
14.8193 0 TD
0.006 Tc
(d )Tj
/F7 1 Tf
0.9518 0 TD
-0.004 Tc
0.2 Tw
[(a)-6(n)2(d)-10( link )]TJ
/F9 1 Tf
3.8916 0 TD
0 Tc
0 Tw
(g)Tj
/F7 1 Tf
0.506 0 TD
0.001 Tc
0.207 Tw
[( selected,)]TJ
-20.1687 -1.1807 TD
-0.003 Tc
0.042 Tw
[(giving a)-5( histo)-9(r)-7(y)15( list {)]TJ
/F9 1 Tf
8.5904 0 TD
0.004 Tc
[(a,b,c,d,e,f)5(,)1(g)]TJ
/F7 1 Tf
4.7108 0 TD
0.002 Tc
0.049 Tw
[(}. If)10( th)8(e person)8( th)8(en)8( w)25(a)0(n)8(t)3(s)]TJ
-13.3012 -1.1807 TD
-0.003 Tc
0.187 Tw
[(to)-9( go)-9( to)-9( )]TJ
/F9 1 Tf
3.8675 0 TD
0.005 Tc
(h, )Tj
/F7 1 Tf
1.1928 0 TD
-0.004 Tc
0.2 Tw
[(r)-8(e)-6(tur)-8(n)2(ing )12(to)-10( hub)-10( )]TJ
/F9 1 Tf
7.253 0 TD
0.006 Tc
(d )Tj
/F7 1 Tf
0.9518 0 TD
0 Tc
0.196 Tw
[(no)-6(w)23( req)-6(u)6(ires three clicks.)]TJ
-13.2651 -1.1807 TD
-0.001 Tc
0.161 Tw
[(T)-16(hus the user')10(s)2( actio)-7(ns to)-7( visit )-12(all )-12(f)7(o)-7(ur )-12(sib)-7(lings )-12(af)7(ter )-12(f)7(i)0(rst)]TJ
0 -1.241 TD
-0.005 Tc
0.008 Tw
[(a)-7(r)-9(r)-9(i)-4(ving o)-11(n)1( p)-11(a)-7(ge)-7( )]TJ
/F9 1 Tf
6.8072 0 TD
0.006 Tc
(d )Tj
/F7 1 Tf
0.759 0 TD
0.003 Tc
(are )Tj
/F9 1 Tf
1.4819 0 TD
0 Tc
0 Tw
(d)Tj
/F12 1 Tf
9.96 0 2.117 9.96 413.084 569.16 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 422.92 569.146 Tm
(e)Tj
/F12 1 Tf
9.96 0 2.117 9.96 427.364 569.16 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 437.2 569.146 Tm
(d)Tj
/F12 1 Tf
9.96 0 2.117 9.96 442.244 569.16 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 452.08 569.146 Tm
(f)Tj
/F12 1 Tf
9.96 0 2.117 9.96 454.844 569.16 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 464.68 569.146 Tm
(e)Tj
/F12 1 Tf
9.96 0 2.117 9.96 469.124 569.16 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 478.96 569.146 Tm
(d)Tj
/F12 1 Tf
9.96 0 2.117 9.96 484.004 569.16 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 493.84 569.146 Tm
(g)Tj
/F12 1 Tf
9.96 0 2.117 9.96 498.884 569.16 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 508.72 569.146 Tm
(f)Tj
/F12 1 Tf
9.96 0 2.117 9.96 511.484 569.16 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 521.32 569.146 Tm
(e)Tj
/F12 1 Tf
9.96 0 2.117 9.96 525.764 569.16 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 535.6 569.146 Tm
(d)Tj
/F12 1 Tf
9.96 0 2.117 9.96 540.644 569.16 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 550.48 569.146 Tm
0.006 Tc
(h,)Tj
/F7 1 Tf
-23.3494 -1.1797 TD
-0.003 Tc
0.187 Tw
[(m)16(a)-5(king )12(a)-5( )12(to)-9(ta)-5(l )12(o)-9(f)5( )12(te)-5(n )12(use)-5(r)-7( a)-5(c)-5(tio)-9(ns.)-6( I)-7(n)3( c)-5(o)-9(ntr)-7(a)-5(st,)-6( the)-5( sta)-5(c)-5(k)3(-)]TJ
T*
-0.001 Tc
0.269 Tw
[(b)-7(a)-3(sed)-7( techniq)-7(u)5(e req)-7(u)5(ires o)-7(n)5(ly)17( seven actio)-7(ns to)-7( visit the)]TJ
T*
0.004 Tc
0.18 Tw
[(s)7(a)2(m)23(e)2( )12(s)7(e)2(t)5( of)12( pag)10(e)2(s)7(,)1( as)7( prev)10(i)5(o)-2(u)10(s)7( s)7(i)5(bl)5(i)5(n)10(g)10(s)7( w)27(e)2(re popped of)12(f)12(:)]TJ
/F9 1 Tf
0 -1.242 TD
0 Tc
0 Tw
(d)Tj
/F12 1 Tf
9.96 0 2.117 9.96 322.964 521.52 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 332.8 521.506 Tm
(e)Tj
/F12 1 Tf
9.96 0 2.117 9.96 337.244 521.52 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 347.08 521.506 Tm
(d)Tj
/F12 1 Tf
9.96 0 2.117 9.96 352.124 521.52 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 361.96 521.506 Tm
(f)Tj
/F12 1 Tf
9.96 0 2.117 9.96 364.724 521.52 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 374.56 521.506 Tm
(d)Tj
/F12 1 Tf
9.96 0 2.117 9.96 379.604 521.52 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 389.44 521.506 Tm
(g)Tj
/F12 1 Tf
9.96 0 2.117 9.96 394.484 521.52 Tm
(\334)Tj
/F9 1 Tf
9.96 0 0 9.96 404.32 521.506 Tm
(d)Tj
/F12 1 Tf
9.96 0 2.117 9.96 409.364 521.52 Tm
(\256)Tj
/F9 1 Tf
9.96 0 0 9.96 419.2 521.506 Tm
(h)Tj
/F7 1 Tf
0.506 0 TD
-0.003 Tc
0.018 Tw
[(.)-6( I)-7(n)3( ge)-5(ne)-5(r)-7(a)-5(l,)-6( to)-9( )-12(visit )-12(n )-12(sp)-9(o)-9(k)3(e)-5( )-12(links)]TJ
-10.6747 -1.1807 TD
0.003 Tc
0.253 Tw
[(f)11(r)-1(om)22( a pag)9(e)1(, th)9(e recen)9(cy)21( w)26(ith)9( spok)9(es )-12(beh)9(a)1(v)9(i)4(or )-12(requ)9(ires)]TJ
/F12 1 Tf
12 0 0 12 319.72 494.52 Tm
0 Tc
0 Tw
(\345)Tj
/F9 1 Tf
6 0 0 6 328.6 500.682 Tm
(n)Tj
12 0 0 12 333.16 495.444 Tm
(i)Tj
/F7 1 Tf
6 0 0 6 328 493.128 Tm
(1)Tj
9.96 0 0 9.96 338.92 495.356 Tm
0.001 Tc
0.568 Tw
[( u)7(s)4(er action)7(s)4( w)24(h)7(ile th)7(e stack)7(-)9(b)-5(ased )-12(m)20(ech)7(an)7(ism)]TJ
-2.1084 -1.4458 TD
0.004 Tc
-0.001 Tw
[(requ)10(i)5(r)0(es)7( on)10(l)5(y)22( 2)]TJ
/F9 1 Tf
6 -0.001 TD
0 Tc
0 Tw
(n)Tj
/F7 1 Tf
0.506 0.001 TD
-0.008 Tc
0.011 Tw
[( - 1)-14(.)]TJ
-6.506 -1.7831 TD
-0.001 Tc
0.606 Tw
[(In sum)18(m)18(a)-3(ry)17(, this schem)18(e)-3( intro)-7(d)-7(u)5(ces o)-7(n)5(e )-12(signif)7(i)0(cant)]TJ
0 -1.1807 TD
0.002 Tc
0.23 Tw
[(adv)8(a)0(n)8(t)3(ag)8(e an)8(d on)8(e sig)8(n)8(i)3(f)10(i)3(can)8(t disadv)8(an)8(tag)8(e)0( n)8(o)-4(t f)10(o)-4(u)8(n)8(d)-4( )-12(in)]TJ
T*
0.001 Tw
[(stack)8(-)10(b)-4(ased n)8(a)0(v)8(i)3(g)8(a)0(tion)8( or pu)8(re recen)8(cy)20(.)]TJ
/F13 1 Tf
0 -1.3005 TD
0 Tc
0 Tw
(4)Tj
/F11 1 Tf
0.8434 -0.0017 TD
( )Tj
/F7 1 Tf
0.5181 0 TD
0.001 Tc
0.062 Tw
[(T)-14(h)7(e )12(list of)9( prev)7(iou)7(s)4(ly)19( v)7(i)2(sited pag)7(e)-1(s is com)20(p)-5(lete becau)7(se)]TJ
0 -1.1807 TD
0.004 Tc
0.216 Tw
[(n)10(o)-2( )12(pag)10(e)2(s)7( )12(are )12(popped )12(of)12(f)12( t)5(h)10(e l)5(i)5(s)7(t)5(.)1( T)-11(h)10(eref)12(ore u)10(s)7(ers)7( are)]TJ
T*
0.002 Tc
0.664 Tw
[(g)8(u)8(a)0(ran)8(t)3(eed to be able )-12(to )-12(rev)8(i)3(sit )-12(pag)8(e)0(s )-12(already)]TJ
T*
-0.004 Tc
0.115 Tw
[(e)-6(n)2(c)-6(o)-10(unte)-6(r)-8(e)-6(d)-10( )12(d)-10(u)2(r)-8(i)-3(ng )12(the)-6(i)-3(r)-8( )12(b)-10(r)-8(o)-10(w)19(sing se)-6(ssio)-10(n)2( b)-10(y)14( using the)]TJ
/F11 1 Tf
9 0 0 9 331.48 379.683 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 351.64 379.676 Tm
-0.002 Tc
0.005 Tw
[( b)-8(u)4(tto)-8(n.)]TJ
/F13 1 Tf
-3.3855 -1.3005 TD
0 Tc
0 Tw
(7)Tj
/F11 1 Tf
0.5663 -0.0017 TD
( )Tj
/F7 1 Tf
0.7952 0 TD
0.004 Tc
0.264 Tw
[(T)-11(h)10(e )12(order )12(of)12( )12(pag)10(e)2( )12(en)10(t)5(r)0(i)5(e)2(s)7( on)10( t)5(h)10(e h)10(i)5(s)7(t)5(ory)22( l)5(i)5(s)7(t)5( can)10( be)]TJ
0 -1.1807 TD
0.023 Tw
[(s)7(e)2(v)10(e)2(rel)5(y)22( di)5(f)12(f)12(e)2(ren)10(t)5( f)12(r)0(om)23( t)5(h)10(e order of)12( )-12(pag)10(e)2( )-12(v)10(i)5(s)7(i)5(t)5(a)2(t)5(i)5(o)-2(n)10(.)1( )-12(T)-11(h)10(i)5(s)]TJ
T*
0 Tc
0.087 Tw
[(ef)8(f)8(ect w)23(ill greatly)18( red)-6(u)6(ce b)-6(r)-4(o)-6(w)23(sing ef)8(f)8(i)1(ciency)18( in certain)]TJ
T*
-0.004 Tc
0.007 Tw
[(na)-6(viga)-6(tio)-10(n ta)-6(sks,)-7( suc)-6(h)2( a)-6(s)-1( hub)-10( a)-6(n)2(d)-10( sp)-10(o)-10(k)2(e)-6(.)]TJ
/F3 1 Tf
9 0 0 9 317.92 308.403 Tm
0.003 Tc
-0.001 Tw
[(4.3 )-320(R)5(ecency)52( w)-19(i)1(th H)5(ub-and-Spoke Enhancement)]TJ
/F7 1 Tf
9.96 0 0 9.96 317.92 296.876 Tm
-0.004 Tc
0.826 Tw
[(T)-19(h)2(e)-6( ne)-6(xt ve)-6(r)-8(s)-1(io)-10(n m)15(o)-10(d)-10(i)-3(fie)-6(s)-1( the)-6( p)-10(r)-8(e)-6(v)2(io)-10(us o)-10(n)2(e)-6( )-12(to)]TJ
T*
0.003 Tc
0.072 Tw
[(accom)22(m)22(odate )12(sim)22(p)-3(le h)9(u)9(b)-3( an)9(d spok)9(e n)9(a)1(v)9(i)4(g)9(a)1(tion)9(.)0( A)14(s)6( bef)11(o)-3(re,)]TJ
T*
-0.001 Tc
(the )Tj
/F11 1 Tf
9 0 0 9 333.4 273.363 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 353.56 273.356 Tm
0.004 Tc
0.095 Tw
[( an)10(d )]TJ
/F11 1 Tf
9 0 0 9 374.92 273.363 Tm
0.002 Tc
[(Forw)17(ard)]TJ
/F7 1 Tf
9.96 0 0 9.96 407.92 273.356 Tm
-0.004 Tc
0.103 Tw
[( b)-10(u)2(tto)-10(ns j)-15(u)2(st m)15(o)-10(ve)-6( a)-6( p)-10(o)-10(i)-3(nte)-6(r)-8( thr)-8(o)-10(ugh)]TJ
-9.0361 -1.1807 TD
0.2 Tw
[(the)-6( list.)-7( Link se)-6(le)-6(c)-6(tio)-10(n,)-7( ho)-10(w)19(e)-6(ve)-6(r)-8(,)-7( ha)-6(s )-12(d)-10(i)-3(ffe)-6(r)-8(e)-6(nt )-12(se)-6(m)15(a)-6(ntic)-6(s.)]TJ
T*
0.002 Tc
0.182 Tw
[(W)-6(h)8(en)8( th)8(e u)8(s)5(er selects a lin)8(k)8( on)8( a pag)8(e)0(, both)8( th)8(e cu)8(rren)8(t)]TJ
T*
0.004 Tc
0.095 Tw
[(pag)10(e)2( )12(an)10(d )12(t)5(h)10(e )12(n)10(e)2(w)27( )12(pag)10(e)2( )12(are added t)5(o)-2( t)5(h)10(e en)10(d of)12( t)5(h)10(e h)10(i)5(s)7(t)5(ory)]TJ
T*
-0.001 Tc
0.341 Tw
[(list. )12(T)-16(h)5(e )12(result )12(is that the nearest hub)-7( p)-7(a)-3(ge is alw)22(a)-3(y)17(s)]TJ
T*
0.002 Tc
0.001 Tw
[(accessible w)25(ith)8( on)8(e click)8( on)8( th)8(e )]TJ
/F11 1 Tf
9 0 0 9 446.68 214.563 Tm
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 466.84 214.556 Tm
-0.002 Tc
0.005 Tw
[( b)-8(u)4(tto)-8(n.)]TJ
-14.9518 -1.7831 TD
-0.004 Tc
0.055 Tw
[(Re)-6(c)-6(o)-10(nsid)-10(e)-6(r)-8( )12(a)-6(g)2(a)-6(i)-3(n the)-6( use)-6(r)-8('s a)-6(c)-6(tio)-10(ns in na)-6(viga)-6(ting fr)-8(o)-10(m)15( p)-10(a)-6(ge)]TJ
/F9 1 Tf
0 -1.1817 TD
0 Tc
0 Tw
(a)Tj
/F7 1 Tf
0.506 0 TD
-0.001 Tc
0.1 Tw
[( to)-7( )]TJ
/F9 1 Tf
1.4819 0 TD
0 Tc
0 Tw
(d)Tj
/F7 1 Tf
0.506 0 TD
0.002 Tc
0.097 Tw
[(, an)8(d th)8(en)8( to )]TJ
/F9 1 Tf
5.5904 0 TD
0 Tc
0 Tw
(d)Tj
/F7 1 Tf
0.506 0 TD
-0.004 Tc
0.103 Tw
[(\222s fo)-10(ur)-8( sib)-10(ling links )]TJ
/F9 1 Tf
8.4217 0 TD
0 Tc
0 Tw
(e)Tj
/F7 1 Tf
0.4458 0 TD
0.003 Tc
(, )Tj
/F9 1 Tf
0.6145 0 TD
0.001 Tc
0.11 Tw
[(f, g)]TJ
/F7 1 Tf
1.3976 0 TD
0.004 Tc
0.107 Tw
[(, an)10(d )]TJ
/F9 1 Tf
2.4217 0 TD
0 Tc
0 Tw
(h)Tj
/F7 1 Tf
0.506 0 TD
0.003 Tc
0.108 Tw
[(. A)14(s)]TJ
-22.3976 -1.1807 TD
-0.005 Tc
0.237 Tw
[(b)-11(e)-7(fo)-11(r)-9(e)-7(,)-8( the)-7( use)-7(r)-9( na)-7(viga)-7(te)-7(s )-12(fr)-9(o)-11(m)14( )]TJ
/F9 1 Tf
13.8193 0 TD
0 Tc
0 Tw
(a)Tj
/F7 1 Tf
0.506 0 TD
-0.001 Tc
0.245 Tw
[( to)-7( )]TJ
/F9 1 Tf
1.7711 0 TD
0 Tc
0 Tw
(e)Tj
/F7 1 Tf
0.4458 0 TD
-0.002 Tc
0.246 Tw
[( b)-8(y)16( link selectio)-8(n)]TJ
-16.5422 -1.1807 TD
0.018 Tw
[(giving a)-5( histo)-9(r)-7(y)15( list o)-9(f)5( {)]TJ
/F9 1 Tf
9.5904 -0.001 TD
0.004 Tc
(a,b,c,d,e)Tj
/F7 1 Tf
3.4217 0.001 TD
0.001 Tc
0.014 Tw
[(}. Sh)7(e th)7(en)7( retu)7(rn)7(s to h)7(u)7(b)-5( )]TJ
/F9 1 Tf
10.5904 -0.001 TD
0 Tc
0 Tw
(d)Tj
/F7 1 Tf
-23.6024 -1.1797 TD
-0.004 Tc
0.127 Tw
[(b)-10(y)14( c)-6(lic)-6(king )]TJ
/F11 1 Tf
9 0 0 9 367.12 149.763 Tm
0.002 Tc
[(Bac)-5(k)]TJ
/F7 1 Tf
9.96 0 0 9.96 387.28 149.756 Tm
0.001 Tc
0.135 Tw
[( on)7(ce an)7(d th)7(en)7( selects th)7(e lin)7(k)7( to pag)7(e)-1( )]TJ
/F9 1 Tf
16.6145 -0.001 TD
0 Tc
0 Tw
(f)Tj
/F7 1 Tf
0.2771 0.001 TD
(.)Tj
-23.8554 -1.1807 TD
0.015 Tc
0.084 Tw
[(Th)21(i)16(s)18( m)34(o)9(v)21(e)13(s)18( )]TJ
/F9 1 Tf
5.0723 0 TD
0.006 Tc
[(bot)7(h)]TJ
/F7 1 Tf
1.7952 0 TD
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0.097 Tw
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y\\\\\m\b\mbmbbmb\b\m\m \m\ \\m\\\\\\\m \\\m\\\\mbmbmbm\mb\m\\\\\\\m1 {\\c\\cccmccccccccccccc\c\c\m \\m\ \\c\\\c\c\c\c\c\ccccccccccccc\c\m\m+y\m\c\\c\\\ccccccc\c\m \\\m \c\\\\\c\\c\c\c\c\c\\c\c\ccccccc\c\m\c\c\m+{\\\\c\c\c\c\c\c\c\c \cc\ \m\\\\\\m \\\m\\\c\\c\\c\\c\c\c\\\\\\\\\\\\\1 \c\m1 _{\m\m\\\m\\y\\m\m\c\mccccccc\c\c\c\ m\\ m\m\\\\\m\\m\\ \m\\\m\\\\\ccccccccc\\\\\c1y\\m\\m\m\c\cc\c\0m\m\m\c\c\c\c\c\c\c\c\c\c\c\cc\c\c\1c\c\c\c\c\\\\\\m0
y\ \m\b\m\b\\\\\b\m\b\ bm\b\ m\\m\\b\m\ m\\\b\m\\\\\\\\\\\\\m\m\m\ \1 y\m\\m\\\\\\\\\\\\\\\\\c\c\c\ m\\\ \m\\m\c\c\c\c\c\c\\\\\\\\\\\\c\\\\\1y\\c\cc\m\c\\\\\\\c\c\ cm\ \\c\m\\m\\m\c\c\c\c\c\c\c\c\\\\\\\c\c\c\c\\+y\m\c\c\c\c\c\c\c\c\ m\c\ m\\\m\c\\ \m\\\cc\cc\cc\m\c\c\c\ccccccm\m\mm+ m\c\+ ty\\\\\\m\\\y\m\c\\c\\\\\\\\c\c\c\c\ \\\\m\m\\\m\\m\ \\\m\c\c\m\c\\\\\\\\c\m\m\+y\c\\\\\\\\c\\c\m+1+1+\c\c\c\c\c\c\c\c\c\c\c\c\\c\c\m+\c\c\c\c\c\m\m\b0 y\m\b\b\b\b\mbb\m\b\b\ \b\b\ \ \\\m\m \\\m\m\\\m\bbbb\m\m\m\\\\\\\m\1 {\\\c\\m\ccccccccccccc\c\c\c\ \c\m \\\m\\\m\c\c\c\c\ccccccccccc\c\c\mc+z\\c\c\\\\c\ccccc\c\c\ \c\c\\\m\c\\\\m\\\c\c\c\c\c\ccccc\m\\c\c\c\m+{\\\\c\c\c\c\c\c\c\c \\\m \m \c\\\m\\\c\m\\c\\c\c\\\c\c\c\c\\\\\\\\\\\1 \c\m1 ]{\m\m\m\\\my\\\\c\c\c\ccccc\c\c\c\c\\\c\m\\\\\m\\\m\\m\\\m\\\m\\\c\c\ccccmc\\\\\c1y\c\m\m\m\c\cc\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\c\\\m\0
y\ \m\b\b\m\b\\b\b\m\\\b\m\\\m\\\m\\\\b\\\\\\m\\\m\\\\\\b\b\m\m\m\ \+ y\m\c\c\c\\\\\\\\\\\\\c\c\c\c\\\m\\\m\\\m\\\c\c\c\c\c\\\\\\\\\\c\c\\\\1y\c\cc\m\c\c\\\c\c\c\c\\\\c\c\m\c\\\m\c\c\m\c\c\c\c\c\c\\\c\\c\c\c\c\\1y\\m\c\c\c\c\c\c\c\c\ccc\\c\\m\c\m\\\m\\\cc\cc\c\c\m\c\c\c\c\m\m\m\m\m+ m\c\+ `x\c\\c\\m\\{\c\c\c\c\c\\\\c\c\c\c\c\cc\\\m\m\\\m\\\\\\m\\\m\\\c\c\c\c\\\\\\\m\m\m+{\\\m\\\\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\c\m\b\0
y\m\b\m\m\b\b\m\m\b\m\m\b\m\m\\\m\\\mb\m\m\m\\\m\\\mmb\b\m\\\\\\\\\m1 {\\\c\c\c\m\ccccccccc\c\c\c\c\m\\\m\\\m\\\c\c\c\c\c\c\cccccccc\c\c\m\m+{\\c\c\\c\c\cc\c\c\c\c\ccc\c\c\\\m\\\c\c\\\c\c\c\c\c\c\cc\c\c\c\c\c\\m+z\c\\\c\c\c\c\c\c\c\c\\\c\c\c\\\c\c\c\c\c\\c\\c\c\c\\\m\\\m\\\\\\\\\\\1 \c\m1 o{\\\c\\\\\\x\\m\c\m\c\ccc\c\c\c\c\c\c\m\\\\\m\\\m\\\m\b\m\\\m\c\c\c\c\ccc\m\\\c\\+y\c\\\m\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\\c\m+
y\ m\b\b\b\m\b\b\bbb\b\b\b\b\\\m\\\m\b\b\b\b\m\\\m\\\\m\\\m\m\m\m\ \0 y\m\\c\c\c\c\c\\\\\\\c\c\c\c\c\\\m\\\m\\\m\c\c\c\c\c\c\c\\\\\\c\c\c\\\1y\\c\c\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\m\\\m\c\c\c\c\c\c\c\\cc\c\c\c\c\c\1y\\m\c\c\c\c\c\c\c\c\m\c\c\c\c\m\\\m\\\c\m\\c\c\c\c\c\\\m\\\m\\m\m\m\m+ m\c\+ `yc\m\c\m\m\{\c\c\\\\c\\c\c\c\c\c\c\c\\\c\m\\\m\b\m\m\\\m\\\m\\\c\c\c\c\\c\\\m\c\m+{\\\m\\\\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\\\0
y\b\b\b\mbb\m\b\m\b\m\\\m\\\m\m\\\m\\\m\\\m\b\m\\\m\bb\m\\\b\b\\\m\m1 {\\\c\c\c\\c\c\ccccc\c\c\c\c\c\m\\\c\c\c\c\c\c\c\c\c\c\c\cccc\c\c\c\mc+y\\c\c\c\c\c\c\\c\c\c\c\cc\c\c\c\c\\\m\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m+{\\\c\c\c\c\c\c\c\c\c\\c\c\\m\\\m\\\m\m\\\c\c\c\c\c\c\m\\\m\\\m\\\\\\\1 \c\m1 5{\\\c\c\c\\y\\c\m\m\c\c\c\c\c\c\c\c\m\m\\\m\\\m\\\\\\\m\\\m\\\m\c\c\c\c\c\c\\\\c\1y\\m\\m\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\m\0
x\ bm\b\b\b\bbb\bbb\b\m\b\m\\\\\m\b\m\\\m\m\mbm\m\\\m\\\m\m\\\m\\\ \+ {\m\\cc\ccc\c\c\c\\\c\c\c\c\c\c\c\m\\\m\c\c\c\c\c\c\c\c\c\c\\c\c\c\\\\1y\m\\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\m\\\\\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\c+y\m\\c\c\c\c\c\c\c\c\c\c\c\m\\\c\c\\\\\m\c\c\c\c\c\c\c\c\m\\\m\\\m\m\m+ m\c\+ Nx\m\cc\c\m\z\c\c\\\c\c\c\c\c\c\c\c\\\\\c\\\m\\\\\m\m\m\\\m\\\m\\\c\m\c\c\c\m\mc\m+{\\\c\\c\\\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\bm0 {bb\\b\mbb\m\b\m\b\m\b\m\\\m\m\\\m \\\\m\ \\\m\\\m\\\\\m\\\m\\m1 {\\\c\\\\\\\c\c\cccc\c\c\c\c\\\m\\\m\\\c\c\c\c\c\c\c\c\c\c\cc\c\c\m\mc+{\\\c\\c\c\c\c\c\c\c\c\c\c\m\c\c\\\m\m\m\m\c\c\c\c\c\c\c\c\c\c\c\c\c\c+{\\c\c\c\c\c\c\c\c\c\c\c\\c\\\m\\\m\m\\\c\c\c\c\c\c\c\c\\\m\\\m\\\\\\\1 \c\m1 2{\\\\\c\\\\y\\c\m\c\c\c\c\c\c\c\c\m\m\c\m\\\m\m\m\\\\\\\m\\\m\\\m\\\c\c\c\c\\\\\\1y\\m\\m\m\m\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\\\\1
y\ m\b\b\b\bbb\bbb\b\b\b\m\b\\\m\\ \m\\m m\\\ bm\\\m\\\m\m\\\m\\\ \+ y\\c\cm\m\c\c\c\\\\\c\c\c\c\c\c\\\m\\\m\\\c\c\c\c\c\c\c\c\c\\c\c\c\\\\1y\\m\\m\c\c\c\c\c\c\c\c\c\c\\\c\m\\\\\\\\\\c\c\c\c\c\c\c\c\c\c\c\c\c\c1y\\\c\c\c\c\c\c\c\c\c\ccc\c\m\\\m\\\c\m\c\c\c\c\c\c\c\m\c\\\m\\\m\\m\m+ m\c\+ ;yc\c\c\c\\\y\c\\\\c\\c\c\c\c\c\c\c\\\c\\\m\m\\\\\b\m\m\b\m\\\m\c\c\c\c\c\c\c\m\mc+{\c\\c\\\\\\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\m+
y\\\b\m\b\m\b\m\b\m\b\m\b\b\m\m\m\ \m b \\\m\\\m\\\\\m\\\m\m\1 ym\\c\\\\c\c\c\cccc\c\c\c\c\c\c\m\\\m\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\m\1y\\\c\\\\c\c\c\c\c\c\c\c\c\c\m\\\c\m\m\c\m\c\c\c\c\c\c\c\c\c\c\c\c\c\m+y\m\\c\c\c\c\c\c\c\c\c\\\c\\\c\m\\\m\\\c\c\c\c\c\c\c\c\\\m\\\m\\\m\\\\1 \\\m1 ;{\\\m\\\m\my\\m\m\c\c\c\c\c\c\c\c\c\c\m\\\\\\\m\m\\\\\m\\\m\\\\\c\c\c\c\c\\c\\\\\1y\\m\\m\m\m\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\c\0
y\ m\m\b\b\bbb\bbb\b\m\b\m\ \ b\\\ b bm\\\m\\\m\m\\\m\\\ \1 {\\m\cccc\c\c\c\\c\c\c\c\c\c\c\c\\\m\\\m\c\c\c\c\c\c\c\c\c\c\c\c\c\m\\+z\m\c\m\c\c\c\c\c\c\c\c\c\c\c\c\m\\\\\m\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c+y\\cc\c\c\c\c\c\c\c\c\cc\c\cm\\m\mm\mm\cc\cc\c\c\c\c\c\c\c\c\\\m\\\mmc1 m\m\+ 9x\m\\\m\\\\{\\\\\c\c\c\c\c\c\c\m\\\m\\\\\m\\\m\\\\\m\\\m\\\m\m\m\c\c\c\c\c\c\m\mc+z\\\c\c\\\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\m\b0
y\\\b\b\m\m\b\m\b\m\b\b\b\m \bm\ b \\\m\\\m\\\\\m\\\m\m\1 x\c\c\\\\\c\c\c\c\c\c\c\c\c\m\\\m\\\\c\\\c\c\c\c\c\c\c\c\c\c\c\c\c\\\m1y\\\c\\c\c\c\c\c\c\c\c\c\c\\c\\\\\\\m\\\\\\\\c\c\c\c\c\c\c\c\c\c\c\c\c+z\c\\c\c\c\c\c\c\c\c\c\cc\m\\\m\ m\cc\cc\c\c\c\c\c\m\\\m\\\m\\\\\1 \\\m1 ,{\\\m\\\m\\y\cm\c\c\c\c\c\c\c\c\c\m\\\m\\\\mm\\m\\m\\m\\\\m\\\\\c\c\c\c\c\c\c\\\\1y\m\c\\m\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\c\0
y\ m\b\b\b\bbb\b\b\b\m\\\b\ \\\\ b bm\\\m\\\m\m\\\m\\\ \0 y\\c\\m\c\c\c\c\c\c\c\c\c\c\c\\m\\m\m\m\m\m\c\c\c\c\c\c\c\c\c\c\c\c\c\+{\\c\c\c\c\c\c\c\c\c\c\c\c\c\\cc\\m\ \\\\\c\c\c\c\c\c\c\c\c\c\c\c\c\c1y\\m\\c\c\c\c\c\c\c\c\c\\c\c\m 11 c\c\c\c\c\c\c\c\\\m\\\m\\\m\\m+ m\m\+ ?yc\\\m\\\m\y\\\\c\\c\c\c\c\c\c\c\\\m\\\\\\\\ \\\\\\\\\\m\\\\\m\c\c\c\c\c\c\c\c\mc+{\\\\c\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\m+c\c\c\c\c\c\c\c\c\c\c\c\c\m\\m1 {\b\b\m\b\m\b\m\b\m\b\m\m\m \ \m\m \ \\\m\\\m\\\\\m\\\m\m\1 ym\c\c\c\c\c\c\c\c\c\c\c\c\\\\m\ \c\c\c\c\c\c\c\c\c\c\c\c\m\m+y\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\\cm\ m\m\\\c\c\c\c\c\c\c\c\c\c\c\c\m+{\\\c\c\c\c\c\c\c\c\c\c\c\c\m 11 m\c\c\c\c\c\\\m\\\m\\\m\\\m\\1 \\\m1 9{\c\c\c\c\\y\m\c\c\c\c\c\c\c\c\c\c\\\m\m\m\ \m\m\\m\\m\b\m\m\\\m\c\c\c\c\c\\\c\\1y\\m\c\c\c\m\c\c\c\c\c\c\c\c\c\c\c\c\11m\\c\c\c\c\c\c\c\c\c\c\\c\c\\\+
x\ \m\b\b\b\b\b\m\b\b\bbm\b m\\ \\ m\b\ \ bm\\\m\\\m\m\\\m\\\ \0 y\\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\ \\c\c\c\c\c\c\c\c\c\c\c\c\\\1y\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\\ \\\m\c\c\c\c\c\c\c\c\c\c\c\c\c+y\m\\c\c\c\c\c\c\c\c\cc\c\c\ m \\ 1 cc\c\c\c\c\c\c\m\\\m\\\m\\\m+ m\m\+ ?xc\m\c\m\\\z\\c\c\c\c\c\c\c\c\c\c\m\c\\\\\ \\\\m\\\\\\b\m\\\c\c\c\c\c\c\c\c\c\m+y\c\\\\\c\c\c\c\c\c\c\c\c\c\c\m1+\c\c\c\c\c\c\c\c\c\c\cc\c\m\m1
{\b\bbbb\m\b\m\b\b\b\mb \ \m\ \\\m m \b\m\\\m\\\b\m\\\m\\m1 {\m\c\c\\c\c\c\c\c\c\c\c\c\\c\c\ \c\c\c\c\c\c\c\c\c\c\c\c\c\m+z\c\c\c\c\c\c\c\c\c\c\c\c\c\\\m\\ cc\\c\c\c\c\c\c\c\c\c\c\c\c\c+{\\c\c\c\c\c\c\c\c\c\c\c\c\m \ cc m\c\c\c\c\c\m\\\m\\\m\c\\\m\1 \\\m1 E{\\\\c\\c\my\\c\c\c\c\c\c\c\c\c\c\\\c\m\\ m\\m\\\\\m\\\c\c\c\c\c\c\c\\\1y\\m\cm\c\c\c\c\c\c\c\c\c\c\c\1+11+11+m\1cc\c\c\c\c\c\c\c\c\c\c\\\\\\+
y\ m\b\m\b\m\b\m\bbm\b\ \\\ b \ \\\\ \\m\ bb\b\m\b\m\\\\\m\\\ \+ y\\c\c\m\c\c\c\c\c\c\c\c\cc\c\c\ \\c\c\c\c\c\c\c\c\c\c\c\\\c\1y\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c c\c\c\c\c\c\c\c\c\c\c\c\c\\c1y\\c\c\c\c\c\c\c\c\c\c\c\c\ 1\ \\m 11+ \c\c\c\c\c\\\c\\\m\\\m\m\\\+ m\m\+ 3yc\c\c\c\\\y\m\\\c\c\c\c\c\c\c\c\c\m\\\m \\\\\\m\\\m\c\c\c\c\c\c\c\m\m+{\\\\c\\c\c\\c\c\c\c\c\c\c\c\m+\\\\\\\c\1c\c\c\c\c\c\c\c\c\c\c\m\m\m1
y\\\b\b\bbb\bbb\b\b\b\m \bm b \\m\\m \m\m \\\\m\b\\\b\m\m\m\\\m\m1 z\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\m \\\m\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m+y\m\c\c\c\c\c\c\c\c\c\c\c\c\\\\\\\\ \c\\c\c\c\c\c\c\c\c\c\c\c\c\c\m+z\\c\c\c\c\c\c\c\c\c\c\\c\c \m\1+111 m\c\c\c\c\m\c\m\c\m\\\\\m\m1 \\\m1 5{\\\m\c\m\cy\\\m\c\c\c\c\c\c\c\c\c\c\c\\ m\\m\m\\\m\\\m\\\c\c\c\c\c\\\1y\m\c\cc\c\cm\c\c\c\c\c\c\c\c\1\\1c\c\c\c\c\c\c\c\c\c\c\\c\\\\+
y\ m\b\m\b\m\b\m\m\b\b\ m\\ \ bm\\\\ \b\m\\\m\m\b\\\\\b\m\ \+ {\\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\ \m\\\c\\c\c\c\c\c\c\c\c\c\c\c\c\\\1y\\\c\c\c\c\c\c\c\c\c\c\c\c\\\\\m\\ \c\c\\c\c\c\c\c\c\c\\c\c\c\c\c\+y\c\c\c\c\c\c\c\c\c\c\cc\c\ \11111 \c\c\c\c\c\c\\\m\\\\\m\\\\\1 m\m\+ ?xcc\c\c\c\\{\\cc\cc\c\c\c\c\c\c\c\c\c\\m\ \m\\\\\m\\\c\c\c\c\c\c\c\c\mc+{\\c\c\\\c\\\c\c\c\c\c\c\c\c\m+1111111m+\\c\c\c\c\c\c\c\c\c\c\ccc\m\m1
{\\\m\b\bbb\bbb\b\b\b\m \b\ b \\\m\b\\\\\\\m\\\m\b\\\\\m\m\m\\\m\1 xc\c\c\\c\c\c\c\c\c\c\c\c\c\\c\m \m\m\c\\c\c\c\c\c\c\c\c\c\c\c\c\m\+y\m\c\c\c\c\c\c\c\c\c\c\c\c\c\m\\\m \c\\c\c\c\c\c\c\c\c\m\c\c\c\c\m+{\\c\c\c\c\c\c\c\c\c\c\c\\m \ 11111 m\c\c\c\c\\\m\\\\\m\m\c\m\m1 \\\m1 5{\\\\c\\\c\y\c\\c\c\c\c\c\c\c\c\c\c\c\\\m\ \\\\\\\\\\\m\\\m\m\\\m\c\c\c\c\c\\\\1y\\c\\m\c\m\c\c\c\c\c\c\c\c\c\c\\\\\\11\cc\c\c\c\c\c\c\c\c\c\c\\\\\\\+
y\ m\b\m\b\m\b\m\b\m\b\ \m\\\\\b bm\\\m\bm\\m\\\m\\\m\m\m\b\\\\\m\ \1 y\\c\cc\c\c\c\c\c\c\c\c\c\c\\m\\ \\\\\\\\\c\c\c\c\c\c\c\c\c\c\c\c\c1y\\\c\c\c\c\c\c\c\c\c\c\c\c\\m\m\m\ m\\c\\c\c\c\c\c\c\c\\\c\c\c\c\\1y\c\c\c\c\c\c\c\c\c\c\cc\c\ 111 \c\c\c\c\c\c\c\m\m\\\\\m\\\+ m\m\+ ;yc\m\c\m\c\z\\c\c\\c\c\c\c\c\c\c\c\\\m\\\\\ \m\b\m\m\m\\\m\\\\\m\c\c\c\c\c\c\m\m+y\c\c\\c\\\\\c\c\c\c\c\c\c\c\c\cccc\c1+c\c\c\c\c\c\c\c\c\c\c\c\c\m\m\m1
y\b\b\bbb\bbb\bbb\b\m\m \b\m\\m\ b\m\b\b\\m\\\m\\\m\\\\\\\\\m\m\b\m\1 {c\c\c\c\\c\c\c\c\c\c\\c\c\c\ c\c\cc\c\c\c\c\c\c\c\c\c\c\c\m\+{\c\c\c\c\c\c\c\c\c\c\c\c\c\\ \c\c\c\c\c\c\c\c\c\c\cc\c\c\c\m+y\\c\c\c\c\c\c\c\c\c\c\\c\\m \c\c\c\c\c\c\c\c\\\\\m\\\c\m1 \\\c1 5{\\c\\c\\c\y\\c\cc\c\c\c\c\c\c\c\c\m\c\\\m\\ \\\\b\b\\\m\\\m\m\\\\\c\c\c\c\c\c\c\1y\\c\ccc\m\c\c\c\c\c\c\c\c\c\c\c\\\c\1\\c\c\c\c\c\c\c\c\c\c\c\\c\\\\\\+
y\ m\m\b\m\b\m\b\m\b\b\ m\b\\m\\ \m\\\m\\\b\m\\\m\\\m\m\m\m\\\\\m\ \0 y\c\c\c\m\c\c\c\c\c\c\c\c\c\\c \c\c\\\c\c\c\c\c\c\c\c\c\c\c\c\\1y\\m\c\c\c\c\c\c\c\c\c\c\c\m\ c\c\\c\c\c\c\\c\c\c\c\\c\c\c\\\1y\c\c\c\c\c\c\c\c\c\c\c\c\c\ m\c\c\c\c\c\c\c\m\m\\\m\\\c\+ m\m\1 ?x\\c\c\c\c\y\c\c\\c\c\c\c\c\c\c\c\c\\\\m\\b\\m\\m\\m\\\b\m\\\\\m\m\c\c\c\c\c\c\cc+z\c\c\\\c\c\c\c\c\c\c\c\c\c\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\m1
y\b\b\bbb\b\bbb\bbb\b\m \b\b\\\m \\\m\\\m\m\\\m\\\m\b\\\\\b\m\m\\\\m1 {\c\c\c\\\c\c\c\c\c\cc\c\c\cc\\ \\\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m+z\c\c\c\c\c\c\c\c\c\c\c\c\c\\ \c\c\c\c\c\c\m\c\c\c\cc\c\c\c\m+{\\c\c\c\c\c\c\c\c\c\c\c\c\c\ \c\c\c\c\c\c\c\\\\\m\\\m\c\m1 \\\m1 9{\c\m\c\c\cy\\c\m\c\c\c\c\c\c\c\c\c\c\c\\m\b\\m\\\\\\m\\\\m\m\c\\\c\c\c\c\c\c\\c\1y\\c\m\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\cc\c\\m\+
y\ m\b\b\m\m\b\m\b\b\m\ m\m\\m\\ bm\\\m\b\\\m\\\m\\\m\m\m\b\\\\\m\ \+ y\\c\c\m\c\c\c\c\c\c\c\c\c\\c\\c \c\c\\\\c\c\c\c\c\c\c\c\c\c\c\c\c\1y\\cc\c\c\c\c\c\c\c\c\c\c\c\c cc\c\\c\c\c\\\\c\c\c\c\c\c\c\c\1y\\c\c\c\c\c\c\c\c\c\c\cc\c\cc m\c\c\c\c\c\c\m\m\\\m\\\c\c\+ m\c\+ Ayc\\\\c\c\\y\c\\c\\c\c\c\c\c\c\c\c\c\m\\\\\\b\\\m\b\\\b\m\\\\\c\c\c\c\c\c\c\c\c\m+{\c\\c\c\\c\c\c\c\c\c\c\c\c\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\b1
y\b\b\m\b\b\bbb\b\mbb\m \\b\b\\b \\\m\\\\\m\\\m\\\m\\\\\\\\\m\m\\\m\1 zc\c\c\\\c\c\c\c\c\c\\c\c\c\c\c\\ \c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\+{\c\\c\c\cc\cc\c\c\c\c\c\c\\c\c\c\c\\\\c\c\c\c\c\c\m\m\c\c\c\c\c\c\c\c+z\\c\c\c\c\c\c\c\c\c\c\\c\c\\c\m \ \c\c\c\c\c\c\c\\\m\\\m\m\\\m1 \c\m1 5{\c\c\c\c\cy\\cc\c\c\c\c\c\c\c\c\c\c\\\\m\m\\\\b\\\m\\\b\m\m\\\m\c\c\c\c\c\c\cc\c+y\\m\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\c\c\+
y\ m\bbbbm\bbbbm\b\bbb\ bb\\m\b\ \m\\\m\m\\\m\\\m\\\m\m\m\m\\\\\m\ \1 y\c\c\m\c\c\c\c\c\c\c\c\c\c\\\\\\\c\\\\\\\c\\c\c\c\c\c\c\c\c\c\c\c\c\c1y\\cc\c\c\\c\c\c\c\c\c\c\c\c\c\c\\\cc\c\\\c\\c\c\c\\\\\c\c\\c\c\c\c\c\1y\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\cc\c\c \c\c\c\c\c\m\\\m\\\m\\\\\c\m\1 m\c\+ ?x\\c\c\c\\\z\c\\c\c\c\c\c\c\c\c\c\c\c\m\\\\mb\\m\b\b\m\b\\\\\m\\\c\c\c\c\c\c\c\cc+z\c\\\c\c\c\c\c\c\c\c\c\c\c\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\c\m0
y\b\bbb\b\b\b\b\b\b\b\m \m\m\\m\ \\\m\b\\\m\\\m\\\m\b\\\\\\\m\m\\\m\1 {\\c\c\c\c\c\c\c\c\c\c\c\c\cc\cc\c\cc\ccc\c\cc\c\c\c\c\c\c\c\c\c\c\c\m+z\c\\c\c\c\c\\c\c\c\c\c\c\c\c\c\cc\\c\c\c\c\c\c\c\c\m\m\c\cc\c\c\c\c\c+z\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\c\c\c\\\m\\\m\\\m\m\m\\\1 \\\m1 9{\m\c\c\c\cy\\m\c\c\c\c\c\c\c\c\c\c\c\m\m\\\\\m\b\m\\\m\m\m\m\\\m\c\c\c\c\c\c\\c\1x\\m\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\0
y\ m\b\m\bbm\b\b\m\m\bb \m\b\m\m\b\m\b\m\b\m\m\m\m\\\b\m\ \+ y\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\c+y\\cc\c\c\c\cc\c\c\c\c\c\c\c\c\c\\cc\c\\c\c\c\c\c\c\\\\\\c\c\c\c\c\c\c1y\\c\c\c\c\c\c\c\c\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\m\\\m\\\\\\\m\+ m\m\+ ?y\\c\c\c\c\y\c\c\c\c\c\c\c\c\c\c\c\c\\\\\\\m\m\b\b\m\b\\\\\\\\\m\\\c\c\c\c\c\cc\c+zc\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\mb0
y\b\b\bbb\b\b\m\b\b\b\b\\\\\\\\\\\b\\\\\\b\b\b\b\b\b\b\b\\\\\m\\\m\m1 {\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\cc\\c+z\c\\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\m\\c\c\c\c\c\c+y\c\c\c\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\m\\\m\\\b\m\m\\\m1 \\\m1 ,{\c\c\c\c\cy\c\c\c\c\c\c\c\c\c\c\c\c\m\m\m\\\b\m\b\b\m\m\m\m\m\\\m\c\c\c\c\c\c\c\1y\\c\c\c\c\c\m\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\0
y\ m\m\bbm\bbm\bbm\bbm\bbm\mbmm\m\m\m\m\m\m\m\m\m\m\m\m\m\m\m\m\m\ \+ y\\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\1y\\cc\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\cc\c\c\c\c\c\c\\\c\c\c\c\c\c\c\1y\\c\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\\\m\\\\\m\m\+ m\c\0 ?xc\c\c\c\\\z\\c\c\c\c\c\c\c\c\c\c\c\c\\\\\\\m\b\b\m\\\\\\\\\\\\\c\c\c\c\c\c\c\\cc+z\\c\\c\c\c\\\\\c\c\c\c\c\c\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m0 y\b b b b b \ b b b b b b b \ \ \ \ \ \ \ \ \ b \ \ \ \ \ \ \ \ \ \m1 zc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m+y\c\\c\c\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\c\cc\c\c\c\c\c+z\c\c\c\c\c\c\c\c\c\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\\m\\\m\c\\\m1 \c\m1 V{\\\c\c\c\cy\\\c\c\c\c\c\c\c\c\c\c\m\c\m\m\m\b\m\b\m\m\m\m\m\m\m\c\c\c\c\c\c\c\c\1y\\c\c\c\c\m\m\m\c\c\c\c\c\c\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\1
yb\b\b\b\b\b\b\b\b\b\b\b\b\b\\\\b\\\b\m\b\\\b\b\b\b\b\b\b\m\\\\\\\\\1 y\\c\c\\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\1y\\cc\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\\c\c\c\c\c\\c\\c\\c\c\c\c\c\c1y\\c\c\c\c\c\c\c\cc\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\c\m\m\b\m\b\m\\\+ m\c\+ Wyc\c\c\c\c\y\c\\\\\\c\\\c\\\c\\\c\\\\\c\\\\\b\b\b\b\b\\\\\\\\\\\\\\\\\\\\\\\\\\\c+y\\\\\c\\\\\\\\\\\\\\\\\\\\\\\\\c\\\\\\\\\\\\\\c\\\\\\\\\\\\\\\\\\\\\\0
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" " " " """ " "" "" "( "" " "" ( (" ( * * (# "#("* * * (("#* ("* (") *( *( *()*) )())))))()))))))))))))*)*****************)c\+ `x\c
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||| " " "" " (( " "" "" (( ( ( ( ( ( ( ("( ( (" *"( *" * * * * * *( * *( )()))()))()))))))))))))))*)*y\\\\\\\\\\\\1 )*\m1 _{\\ |||||
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[(R)7(o)-3(s)6(e)1(n)9(f)11(eld, L)12(.)0( an)9(d Morv)9(ille, P)-7(.)0( \(1998\) )]TJ
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[(Architecture )12(for the W)16(o)-4(rld W)16(i)3(de W)16(e)0(b.)]TJ
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[(S)6(a)2(n)10(o)-2(, D. \(1996\))]TJ
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[( Des)7(i)5(gni)5(ng l)5(a)-2(r)7(g)-2(e-s)7(c)2(al)5(e w)8(e)2(b s)7(i)5(t)5(e)2(s)7(:)0( A vi)5(s)7(ual)]TJ
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[(W)-11(ile)-5(y)15( Co)-9(m)16(p)-9(ute)-5(r)-7( P)-13(u)3(b)-9(lishing.)]TJ
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[(T)-11(a)2(u)10(s)7(ch)10(er, )12(L)13(.)1( an)10(d Green)10(berg)10(, S)6(.)1( \(1997\) How)27( peopl)5(e rev)10(i)5(s)7(i)5(t)]TJ
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[(W)-9(e)-3(b)-7( p)-7(a)-3(ges: Em)18(p)-7(i)0(rical f)7(i)0(nd)-7(ings and)-7( im)18(p)-7(licatio)-7(ns f)7(o)-7(r )-12(the)]TJ
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[(d)-9(e)-5(sign o)-9(f)5( histo)-9(r)-7(y)15( sy)15(stem)16(s.)-6( )]TJ
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-10.5542 -1.1928 TD
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6.0602 0 TD
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(47)Tj
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[(\(1\), pp. 97-)13(138.)]TJ
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EI
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