Bob is furry. Bob is green. Bob is quiet. Bob is red. Bob is smart. Charlie is smart. Fiona is white. Harry is furry. Harry is quiet. Harry is smart. If something is green then it is red. All round, smart things are furry. If something is quiet and white then it is furry. All furry, round things are smart. Smart things are round. All round, red things are white. Furry things are green. If something is round then it is white.
Fiona is not white.