Anchor: Boy with dark skin, standing on his head with legs spread, at the end of a floating wooden boat.
Entailed: A boy is on a boat.
Contradiction: Huckleberry Finn puts on an acrobatic show for onlookers.
Contradiction: The boy is not on a boat.
Contradiction: A boy with white skin is swimming
Contradiction: A boy is sitting quietly on the dock.
Contradiction: There are fish on land.