Man pages matching name unselect_palette in section 3alleg4:

unselect_palette.3alleg4.en	debian 10 / allegro4-doc
unselect_palette.3alleg4.en	debian 11 / allegro4-doc
unselect_palette.3alleg4.en	debian 12 / allegro4-doc
unselect_palette.3alleg4.en	debian 13 / allegro4-doc