if something requires something else then that something else is important to that something
goods is not tangible_thing. goods is tangible_thing. thing is not object. most_important_thing_have is each_other. etcher is tangible_thing. else is not river. most_important_thing_have is not each_other. etcher is not tangible_thing. space is not what_between_else. fault is not tangible_thing.