Anchor: Two soccer players fall down attempting to get to the ball.
Entailed: Soccer players are going for the ball.
Contradiction: Two lacrose players fall down attempting to get to the ball.
Contradiction: I'm sorry, I can neither recommend nor sell this product to you.
Contradiction: I can't think of anything else to say about that.
Contradiction: Wolves! Fenner sniffed. 
Contradiction: This raises an important policy issue.