Fiona is quiet. Fiona is rough. Fiona is round. Gary is cold. Gary is furry. Gary is green. Gary is rough. All quiet things are green. Rough, furry things are round. All green things are furry. If something is young then it is round. Young, green things are rough. If Fiona is young and Fiona is rough then Fiona is round.
Gary is not furry.