context: It is probably not the case that Fred went to the hallway. Chances are about even that Bernhard is a swan. It is certain that Lily is green.
hypothesis: Chances are about even that either Fred went to the hallway, or Bernhard is a swan.
valid_hypothesis: Chances are about even that either Fred went to the hallway, or Bernhard is a swan.
invalid_hypothesis: There is almost no chance that either Fred went to the hallway, or Bernhard is a swan.
hypothesis_assertion: Either Fred went to the hallway, or Bernhard is a swan.