sentences: if something is made up of something else then that something else can be lost in that something
docs: storage is somewhere_to_put_things. separated_thing is divided_thing. pawn is tangible_thing. else is river. change is when_one_thing_becomes_another_thing. man_made is unnatural_thing. thing is artifact. lost_river is tangible_thing. lost_river is natural_thing. stealing is unnatural_thing.