Anchor: Two young boys play besides a lake, throwing rocks into the water.
Entailed: There are two young males playing besides a lake.
Contradiction: A group of adults are frolicking around for no reason.
Contradiction: Two boys with skateboards at the skate park.
Contradiction: The boys are piloting the 747.
Contradiction: The boys are playing with toy cars.
Contradiction: Two boys swim in a pond.