gap(1) on Linux
The text 8c1bcec3df1c, as Debian 8 (Jessie) shipped it.
Groups, Algorithms and Programming
Flags it lists
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-T -
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-Y -
-a -
-b -
-c -
-e -
-f -
-g -
-h -
-i -
-l -
-m -
-n -
-o -
-q -
-r -
-x -
-y