Anchor: Blue crabs are being sold from a bucket at a fish market.
Entailed: Crabs are being sold.
Contradiction: A tree is waiting ominously.
Contradiction: The skier is at the beach
Contradiction: I know they can hold it off for years. 
Contradiction: A man without a shirt is laying flat on a concrete ledge behind a building.
Contradiction: Pisak was smart and good at math.