Anchor: A male surfer on a white surfboard jumps a wave.
Entailed: The surfer is near some sand.
Contradiction: The man is riding a jet ski.
Contradiction: The county has a pay-as-you-go Social Security system. 
Contradiction: A woman is performing.
Contradiction: The two people are visiting the Smithsonian in Washington D.C. for the first time.
Contradiction: A person is surrounded by wintery conditions.