if something is used for something else, then that something else is the job of that something
everything is one_thing. used_car is used_thing. used_thing is not artifact. used_thing is artifact. used_object_for_sale is not used_thing. change is when_one_thing_becomes_another_thing. used_car is not used_thing. used_object_for_sale is used_thing. everything is not one_thing.