Anchor: a boy in a white shirt and green helmet is riding a skateboard down some steps.
Entailed: The boy is skateboarding outside.
Contradiction: The boy is riding a bicycle down the steps.
Contradiction: The river spikes would be enough on their own.
Contradiction: a baby plays with toys
Contradiction: There is no such thing as a federal mission.
Contradiction: The small harbor is a lovely place to have lunch.