Dave is young. Harry is round. If Harry is rough and Harry is round then Harry is young. All young people are not quiet. If someone is cold and not green then they are not rough. If someone is round then they are rough. If someone is young and not round then they are big. If someone is quiet and not cold then they are big. If Dave is round and Dave is not cold then Dave is big. If someone is not round and not big then they are quiet.
Dave is not cold.