Dave is white. Erin is blue. Erin is quiet. Erin is white. Gary is round. Harry is cold. Harry is young. All quiet, round things are blue. Quiet, blue things are cold. If Gary is round then Gary is quiet. If something is green then it is not young. If something is cold then it is young. All cold things are round. Quiet, young things are not green. If Harry is green and Harry is young then Harry is not cold. If something is quiet and not cold then it is green.
Dave is white.