sympmm.icn: Program to produce pmm symmetry composite images

February 4, 1995; Ralph E. Griswold
Requires: Version 9 graphics
This file is in the public domain.

This program reflects and concatenates images in the horizontal and
vertical directions to produce composite images with the pmm ("prickly
pear") plane symmetry.  The resulting images tile seamlessly.

The composite images are given the base name of the input images with
"_pmm" appended.

Warning:  This program is slow.

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