if two things are both something else, then they are different kinds of that something else
opposites is not two_things. everything is one_thing. separated_thing is divided_thing. opposites is two_things. separated_thing is not divided_thing. pair_of_things is not two_things. bins_and_boxes is both_things_for_storing_other_objects. pair_of_things is two_things. another_way_to_say_separates_things is divides_objects. everything is not one_thing.