Dave is big. Fiona is not big. Fiona is round. Rough, big things are cold. Cold things are not round. If Dave is blue then Dave is green. All quiet things are not blue. If something is round and not cold then it is blue. If something is cold and not blue then it is round. If something is big and not round then it is not cold. If something is not round then it is not rough.
Fiona is not big.