Bob is furry. Bob is green. Bob is not quiet. Bob is not rough. Charlie is green. Charlie is red. Charlie is rough. Fiona is cold. Fiona is furry. Fiona is green. Fiona is quiet. Fiona is red. Fiona is rough. Gary is cold. Gary is quiet. Gary is not young. If Gary is not cold and Gary is not young then Gary is not furry. If Fiona is not young then Fiona is quiet. If Gary is not green then Gary is red. If Bob is rough then Bob is red. If Charlie is not green then Charlie is furry. All quiet, green people are rough.
Bob is young.