context: A biker with a blue jacket, black pants, and white helmet driving on dirt while people watch.
hypothesis: Chances are about even that a biker is getting ready to race against his opponents.
valid_hypothesis: Chances are about even that a biker is getting ready to race against his opponents.
invalid_hypothesis: It is impossible that a biker is getting ready to race against his opponents.
hypothesis_assertion: A biker is getting ready to race against his opponents.