context: It is probably the case that Julius is a swan. It is probably not the case that Brian is a rhino. It is unlikely that Bernhard is white.
hypothesis: It is probably not the case that either Brian is a rhino, or Bernhard is white.
valid_hypothesis: It is probably not the case that either Brian is a rhino, or Bernhard is white.
invalid_hypothesis: It is probably the case that either Brian is a rhino, or Bernhard is white.
hypothesis_assertion: Either Brian is a rhino, or Bernhard is white.