Anchor: During a basketball game a player is about to dunk while the opposition does what he can to block it.
Entailed: During a basketball game a player is about to dunk
Contradiction: During a basketball game a player is not about to dunk
Contradiction: This guy is thirsty.
Contradiction: The motorcycle rider is performing tricks.
Contradiction: A woman is cleaning the floor.
Contradiction: Oh, I love that.