9783692920
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original
alcelaphine
anal
anal_sex
antelope
anthro
artbyyellowdog
avian
bird
bovid
canid
canine
comic
dennis_ritchie
duo
english_text
genitals
gnu
gnu_(operating_system)
gnu_project
hi_res
human
humor
linux
male
male/male
mammal
mascot
monochrome
penetration
penguin
penis
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tux_the_penguin
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