context: A man wearing padded arm protection is being bitten by a German shepherd dog.
hypothesis: Chances are slight that a man is being bitten by a dog while walking.
valid_hypothesis: Chances are slight that a man is being bitten by a dog while walking.
invalid_hypothesis: It is certain that a man is being bitten by a dog while walking.
hypothesis_assertion: A man is being bitten by a dog while walking.