context: It is probable that Bernhard is a swan. It is likely that Lily is yellow. It is likely that John is in the office.
hypothesis: It is impossible that either John is in the office, or Bernhard is a swan.
valid_hypothesis: Chances are about even that either John is in the office, or Bernhard is a swan.
invalid_hypothesis: It is impossible that either John is in the office, or Bernhard is a swan.
hypothesis_assertion: Either John is in the office, or Bernhard is a swan.