ppmimgvquant(1) on Linux
The text 499a9b7ae27f, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 3.1 (Sarge), Debian 3.0 (Woody), Debian 2.2 (Potato) shipped it.
palette quantifier for Pilot Image Viewer pgm files, version 2.0.
Flags it lists
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-4 -
-h -
-v