Dave is not red. Fiona is quiet. Gary is quiet. Harry is smart. All green things are round. If Fiona is white and Fiona is smart then Fiona is not blue. If something is not quiet and not blue then it is green. If Fiona is red then Fiona is round. If something is round and not smart then it is white. If something is blue and not white then it is red.
Dave is not round.