Bob is big. Bob is blue. Bob is furry. Bob is green. Bob is nice. Bob is quiet. Dave is blue. Dave is green. Dave is round. Erin is blue. Erin is quiet. Erin is round. If something is furry and round then it is blue. Green, blue things are quiet. If something is big then it is round. If Erin is quiet and Erin is round then Erin is green. Furry, round things are green. If something is round then it is blue.
Bob is not round.