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black_hair blue_eyes brown_hair chell digital_media_(artwork)duo feet female female_human gesture gordon_freeman grandfathered_content gravity_gun green_eyes hair half-life high_five human human_only humor light_body light_skin male mammal not_furry portal portal_(series)portal_gun science simple_background star tan_hair toes unknown_artist valve valve_corporation white_background zero-point_energy_field_manipulator