Dave is rough. Erin is round. Fiona is smart. If something is furry then it is green. All furry, smart things are not round. If Fiona is smart then Fiona is not rough. Green things are not smart. If something is green and not rough then it is not smart. Kind things are not furry. All furry things are smart. If something is green then it is white.
Fiona is not white.