Anne is not rough. Charlie is not furry. Charlie is rough. Charlie is not round. Charlie is young. Dave is quiet. Dave is not round. Dave is young. Fiona is not blue. Fiona is not furry. Fiona is rough. Fiona is young. All furry people are rough. If Fiona is red then Fiona is blue. If Fiona is not red then Fiona is rough. All round people are young. Quiet, furry people are rough. If someone is young and not rough then they are not round.
Dave is not rough.