This note illustrates the power of software interrupts
(traps) and text diversions in document preparation languages by considering three
difficult problems in typesetting: figure placement; setting text in
arbitrary shapes; and balancing final columns in multi-column layout.
The solution of each of these in the \fBnroff\fR document preparation
system is discussed, and an Appendix gives the \fBnroff\fR macros
which accomplish the task.
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