Anchor: Two men are competing in a track and field event involving hurdles.
Entailed: Two men are participating in a sport.
Contradiction: Two men are pole vaulting at a track and field event.
Contradiction: There are no animals in the water.
Contradiction: The skateboarder is moving fast along the ground on his/her skateboard.
Contradiction: They know how to swim.
Contradiction: The workers are talking.