Bob is blue. Bob is green. Dave is white. Fiona is blue. Fiona is white. Gary is white. Gary is young. If something is blue then it is red. If something is white and kind then it is blue. If something is round and white then it is blue. Green things are white. If Bob is green and Bob is round then Bob is blue. White things are round. If something is kind and young then it is round. All red things are white.
Bob is not young.