Anchor: It does not matter, said Poirot, not betraying any sign of disappointment. 
Entailed: Poirot did not betray any sign of disappointment. 
Contradiction: Poirot said it did matter and he was very obviously disappointed. 
Contradiction: You want that.
Contradiction: a woman is wearing a shoe
Contradiction: The woman is driving a car.
Contradiction: The USO has a restrictive definition.