Bob is blue. Bob is furry. Bob is rough. Bob is round. Bob is smart. Erin is blue. Erin is red. Erin is smart. Fiona is blue. Fiona is furry. Fiona is red. Fiona is rough. Fiona is round. Fiona is smart. Fiona is young. If Bob is young and Bob is furry then Bob is blue. If something is smart then it is round. All rough, round things are smart.
Erin is not furry.