sentences: if something releases something else then that something is the source of that something else
docs: directions_to_get_somewhere is how_to_thing. another_way_to_say_separates_things is divides_objects. thing is substance. storage is somewhere_to_put_things. sometimes_change is good_thing. source_materials is source. change is when_one_thing_becomes_another_thing. electricity is source_of_power. space is what_between_else. inorganic_substance is tangible_thing.