Anchor: Two small children are twirling sparkling rope.
Entailed: Two kids are playing with twine
Contradiction: Two adults are playing
Contradiction: Union Pacific competed with the Los Angeles Salt Lake line to put it out of business.
Contradiction: One LC50 was delivered to be tested for toxicity. 
Contradiction: a man is napping on the hood of a car
Contradiction: Overworked engineers can cause trouble.