context: a skateboarder is performing stunt on a graffiti covered skateboard ramp.
hypothesis: There is a better than even chance that a skateboard is performing in front of his friends.
valid_hypothesis: There is a better than even chance that a skateboard is performing in front of his friends.
invalid_hypothesis: There is little chance that a skateboard is performing in front of his friends.
hypothesis_assertion: A skateboard is performing in front of his friends.