context: A gymnast in a blue and pink leotard is standing on her right foot with her left foot in the air and waving a ribbon.
hypothesis: It is impossible that a gymnast is strecthing before the match.
valid_hypothesis: It is impossible that a gymnast is strecthing before the match.
invalid_hypothesis: It is certain that a gymnast is strecthing before the match.
hypothesis_assertion: A gymnast is strecthing before the match.