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anthro backsack balls big_butt blue_clothing blue_footwear blue_shoes boom970 bubble_butt butt canid canine clothing fan_character footwear footwear_only genitals grin grinning_at_viewer hi_res hybrid looking_at_viewer looking_back looking_back_at_viewer lying lying_on_ground male mammal mostly_nude nude nude_anthro nude_male on_front on_ground presenting_balls sega shoes shoes_only simple_background smile smiling_at_viewer solo sonic_the_hedgehog_(series)