Dave is blue. Dave is furry. Dave is green. Dave is round. Dave is smart. Fiona is big. Fiona is furry. Fiona is green. Fiona is round. Fiona is smart. Fiona is young. Gary is big. Gary is furry. Gary is smart. Gary is young. Blue things are young. All green, young things are round. Blue things are big. All young things are green. If something is smart and round then it is furry. If Fiona is round and Fiona is furry then Fiona is smart.
Dave is not young.