if something is lost in something else then that something is a whole of that something else
pawn is not tangible_thing. abandoned_thing is not tangible_thing. abandoned_thing is tangible_thing. lost_river is tangible_thing. burnt_thing is tangible_thing. lost_river is not natural_thing. else is not river. lost_river is natural_thing. lost_river is not tangible_thing. burnt_thing is not tangible_thing.