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This module is intended for use by the RE module.
It is in a separate module to keep RE itself cleaner
since the algorithm, 'rectangle selection', is a quite
separate part that depends on some tricky heuristics.
The primary entry function is
chooserects(lines, gauges)
It chooses 'the best' rectangles from lines to base simplification on.
A weight on atoms is given by gauges.
pr() gives some example usages of chooserects.
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