Bob is big. Bob is quiet. Bob is rough. Bob is young. Fiona is big. Fiona is green. Fiona is rough. Fiona is young. Gary is green. Gary is quiet. Gary is round. Gary is not young. Harry is big. Harry is not green. Harry is quiet. Harry is rough. All green things are rough. All quiet, young things are big. Young, green things are round. If something is green then it is quiet. If something is not quiet then it is not rough. If something is not quiet then it is round. If Harry is red and Harry is not round then Harry is young. If something is not young then it is rough.
Bob is young.