Bob is rough. Charlie is green. Charlie is quiet. Charlie is round. Charlie is smart. Charlie is young. Fiona is green. Fiona is quiet. Fiona is rough. Fiona is round. Fiona is smart. Fiona is white. Fiona is young. Gary is white. Green people are quiet. All smart, white people are young. If someone is white then they are smart. All quiet, young people are round. Rough people are white. If someone is quiet then they are young. Rough, smart people are green. Quiet people are rough.
Gary is not green.