equipment is a mean of public with ordered recessive of top / extreme / low
stringed_instrument is single_user_device. high_jump_bar is sports_equipment. strict_total_ordering is event_like_ordering. equipment is instrumentality. sports_equipment is non_agentive_artifact. game_equipment_set is collectable. partially_ordered_set is category. playground_equipment is non_agentive_artifact. extreme is measure_of_location. fitness_equipment is non_agentive_artifact.