context: A person on a bike is midair, twisting his body around the handlebars, with graffiti behind him.
hypothesis: Chances are slight that a person is performing tricks in front of a crowd.
valid_hypothesis: Chances are slight that a person is performing tricks in front of a crowd.
invalid_hypothesis: It is probably the case that a person is performing tricks in front of a crowd.
hypothesis_assertion: A person is performing tricks in front of a crowd.