Bob is big. Bob is blue. Bob is quiet. Bob is rough. Bob is round. Bob is smart. Bob is young. Dave is big. Dave is round. Dave is smart. Dave is young. Erin is big. Erin is quiet. Erin is round. Erin is smart. Erin is young. All quiet things are rough. Round, quiet things are blue. If Erin is young then Erin is round. If something is round then it is rough. If something is round then it is big. If something is smart then it is blue. All rough things are big. If something is young and smart then it is rough.
Bob is not rough.