context: a lone surfboarder on a white surfboard flying through the air over a wave
hypothesis: It is impossible that a lone surfboarder is practicing for an upcoming competition.
valid_hypothesis: Chances are about even that a lone surfboarder is practicing for an upcoming competition.
invalid_hypothesis: It is impossible that a lone surfboarder is practicing for an upcoming competition.
hypothesis_assertion: A lone surfboarder is practicing for an upcoming competition.