Bob is young. Bob is round. Bob is green. Bob is cold. Bob is big. Dave is young. Dave is rough. Dave is blue. Dave is big. Eric is kind. Eric is blue. If someone is kind and blue and rough then they are young. If someone is rough and cold then they are kind. If someone is young and round and kind then they are blue. If someone is round and big and cold then they are rough. If someone is blue and rough then they are green.
Bob is not blue.