Anchor: A lone surfer rides down the wall of a huge cresting wave.
Entailed: A surfer is riding a wave.
Contradiction: A surfer is paddling on the calm water.
Contradiction: No where in particular, Tuppence told the driver.
Contradiction: He really means it when he says 'Your head is on the line'.
Contradiction: A man swims laps in a pool.
Contradiction: Anthropologists made this discovery when they examined skeletons from a region that went back 30 generations.