Anchor: a cyclist wearing sunglasses and a silver bicycle helmet competing in a race.
Entailed: The bicycle marathon is taking place outside.
Contradiction: The cyclist is at home reading a book.
Contradiction: Posner has free power to do anything he wants
Contradiction: The two drinking men are observing another man.
Contradiction: The academic pecking order, and all that it involves, is vital for a scientific attitude. 
Contradiction: Absolutely, Miss Tuppence.