if something requires something else then that something relies on that something else
sharp_thing is tangible_thing. another_way_to_say_separates_things is divides_objects. etcher is tangible_thing. person is individual_unlike_other. separated_thing is divided_thing. unevenness is tangible_thing. change is when_one_thing_becomes_another_thing. goods is tangible_thing. subject is thing. matter is tangible_thing.