Bob is blue. Bob is furry. Bob is rough. Charlie is blue. Charlie is rough. Charlie is smart. Charlie is white. Dave is blue. Dave is green. Dave is rough. Dave is smart. Gary is blue. Gary is furry. Gary is rough. Gary is white. If something is green and smart then it is furry. If something is rough then it is green. If something is smart and young then it is blue. If Charlie is blue then Charlie is smart. If something is smart and furry then it is green. All rough, furry things are young.
Dave is white.