Charlie is big. Dave is blue. Fiona is not blue. All blue, rough people are green. Rough, blue people are not big. If Charlie is green and Charlie is white then Charlie is not rough. If someone is big and not rough then they are green. If Charlie is blue and Charlie is white then Charlie is not quiet. If Charlie is white and Charlie is not rough then Charlie is blue. If someone is white then they are round. If someone is blue and not round then they are not green.
Dave is not round.