Bob is furry. Bob is nice. Bob is red. Bob is round. Bob is white. Fiona is green. Fiona is nice. Fiona is red. Fiona is round. Harry is furry. Harry is green. Harry is nice. Harry is rough. Harry is round. Harry is white. If Fiona is rough and Fiona is round then Fiona is white. If something is red then it is rough.
Fiona is not red.