Dave is young. If something is green then it is not furry. Round things are furry. If Dave is big and Dave is red then Dave is not furry. If something is not red then it is quiet. If something is furry and red then it is big. If Dave is quiet then Dave is not big. If something is furry and not young then it is not green. If something is not furry then it is not green.
Dave is round.