context: A crowd of interested people surrounds a man swinging a sledgehammer.
hypothesis: It is impossible that a man shows a group of people how to use a sledgehammer.
valid_hypothesis: It is impossible that a man shows a group of people how to use a sledgehammer.
invalid_hypothesis: It is probably the case that a man shows a group of people how to use a sledgehammer.
hypothesis_assertion: A man shows a group of people how to use a sledgehammer.