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bendedede black_sclera book clothing colored_sclera crossover echidna female green_eyes group hair hi_res holding_book holding_object human machine male mammal metal_knuckles monotreme neck_ribbon neon_genesis_evangelion red_eyes red_neckwear rei_ayanami ribbons robot robot_anthro school_uniform sega short_hair sitting sketch sonic_the_hedgehog_(series)trio uniform