context: A young boy giving his brother a piggyback ride
hypothesis: It is highly unlikely that a boy is giving his brother a piggyback ride in the park
valid_hypothesis: It is highly unlikely that a boy is giving his brother a piggyback ride in the park
invalid_hypothesis: Chances are about even that a boy is giving his brother a piggyback ride in the park
hypothesis_assertion: a boy is giving his brother a piggyback ride in the park