Dave is furry. Erin is blue. Erin is cold. Erin is furry. Erin is quiet. Erin is rough. Fiona is blue. Fiona is rough. Gary is quiet. Gary is rough. If something is blue then it is young. If something is red then it is blue. Red, quiet things are rough. Furry things are quiet. If something is red then it is quiet. If something is cold and quiet then it is red. Blue, red things are cold. If something is quiet and furry then it is cold.
Dave is not blue.