Anchor: A boy surfs on a wave.
Entailed: A person in the water.
Contradiction: The boy snowboards.
Contradiction: The construction of the Eiffel Tower was no big deal.
Contradiction: There are 6 areas where you can look for summaries of recent studies addressing retirement saving adequacy. 
Contradiction: He hurried her along as she stumbled away
Contradiction: It took a while for her to admit that she knows.