context: The dog's mouth is open like he is yawning.
hypothesis: There is little chance that a dog is yawning because he is tired from a walk
valid_hypothesis: There is little chance that a dog is yawning because he is tired from a walk
invalid_hypothesis: There is a better than even chance that a dog is yawning because he is tired from a walk
hypothesis_assertion: a dog is yawning because he is tired from a walk