context: A woman and two children walk along stones to cross a river while a dog swims.
hypothesis: There is a better than even chance that a dog is about to be attacked by a gator.
valid_hypothesis: It is impossible that a dog is about to be attacked by a gator.
invalid_hypothesis: There is a better than even chance that a dog is about to be attacked by a gator.
hypothesis_assertion: A dog is about to be attacked by a gator.