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2018 abstract_background ancientonyx arched_back arm_support athletic athletic_male bent_over blush bubble_butt butt clothing echidna fur furniture gloves handwear knuckles_the_echidna leaning leaning_forward looking_at_viewer looking_back male mammal monotreme mostly_nude portrait presenting presenting_hindquarters purple_eyes quills_(anatomy)rear_view red_body red_fur sega solo sonic_the_hedgehog_(series)table three-quarter_portrait