context: A man in a black and blue jacket and a white helmet skiing down a hill swiftly.
hypothesis: It is certain that a man goes down the ski hill swiftly because he is an expert.
valid_hypothesis: Chances are about even that a man goes down the ski hill swiftly because he is an expert.
invalid_hypothesis: It is certain that a man goes down the ski hill swiftly because he is an expert.
hypothesis_assertion: A man goes down the ski hill swiftly because he is an expert.