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2018 5_fingers all_fours anthro anus backsack balls big_butt biped blac_jackel666 butt equid equine eyewear fingers genitals glasses grey_background greyscale guide_lines hair hand_on_butt head_turned hi_res hooves humanoid_hands looking_at_viewer looking_back male mammal markings monochrome perineum presenting presenting_anus presenting_hindquarters round_glasses simple_background sketch solo spread_butt spreading striped_markings stripes tail three-quarter_view zebra