context: It is almost certain that Brian is a rhino. There is a better than even chance that Bernhard is a swan. It is impossible that Antoine is thirsty.
hypothesis: Chances are about even that either Brian is a rhino, or Bernhard is a swan.
valid_hypothesis: Chances are about even that either Brian is a rhino, or Bernhard is a swan.
invalid_hypothesis: There is almost no chance that either Brian is a rhino, or Bernhard is a swan.
hypothesis_assertion: Either Brian is a rhino, or Bernhard is a swan.