context: A basketball player with green shoes is dunking the ball in the net while the arena crowd looks on.
hypothesis: It is certain that a famous NBA player is playing street ball in front of a crowd.
valid_hypothesis: It is impossible that a famous NBA player is playing street ball in front of a crowd.
invalid_hypothesis: It is certain that a famous NBA player is playing street ball in front of a crowd.
hypothesis_assertion: A famous NBA player is playing street ball in front of a crowd.