Bob is blue. Bob is cold. Bob is green. Bob is quiet. Bob is rough. Bob is round. Bob is young. Dave is blue. Dave is cold. Dave is green. Dave is quiet. Dave is rough. Dave is round. Erin is green. Erin is rough. Gary is round. If something is green then it is young. Young things are cold. Round things are rough. All quiet things are round. If something is rough then it is green. If something is cold then it is quiet. All quiet things are round. Rough, green things are young. If Bob is quiet then Bob is blue.
Gary is not young.