sentences: if taking in something is used to get something else then that something is a source of that something else
docs: directions_to_get_somewhere is how_to_thing. using_one's_mind is using_reason. used_thing is artifact. stealing is taking. source_materials is source. loading_weapon is putting_into_else. used_object_for_sale is used_thing. thing is aim. used_car is used_thing.