context: Two men riding a boat in clear water on a sunny day.
hypothesis: Chances are slight that two men fish in a boat on a river on a sunny day.
valid_hypothesis: There is a better than even chance that two men fish in a boat on a river on a sunny day.
invalid_hypothesis: Chances are slight that two men fish in a boat on a river on a sunny day.
hypothesis_assertion: Two men fish in a boat on a river on a sunny day.