Anchor: A boy on a surfboard in midair.
Entailed: A boy is in the water.
Contradiction: The boy is on the beach.
Contradiction: Gates was driving the whole time.
Contradiction: The huge risk he took makes it clear to us that he was aware of its great importance.
Contradiction: The girl is running a marathon with chimpanzees.
Contradiction: An email address allows the public to respond with their commentary electronically.