context: We doubt that Bernhard is a swan. It is highly likely that Sandra took the football. Chances are slight that Brian is a lion.
hypothesis: It is probably not the case that either Brian is a lion, or Bernhard is a swan.
valid_hypothesis: It is probably not the case that either Brian is a lion, or Bernhard is a swan.
invalid_hypothesis: It is probable that either Brian is a lion, or Bernhard is a swan.
hypothesis_assertion: Either Brian is a lion, or Bernhard is a swan.