context: It is unlikely that John moved to the office. Chances are slight that Mary took the apple. It is probable that Bernhard is gray. Chances are slight that if Bernhard is gray, and Mary took the apple, then Bill went to the bedroom. We believe that if John moved to the office, and Bernhard is gray, then Fred is in the park. It is probable that if either Mary took the apple, or Bernhard is gray, then Winona is a mouse.
hypothesis: There is little chance that either Fred is in the park, or Bernhard is gray.
valid_hypothesis: There is a better than even chance that either Fred is in the park, or Bernhard is gray.
invalid_hypothesis: There is little chance that either Fred is in the park, or Bernhard is gray.
hypothesis_assertion: Either Fred is in the park, or Bernhard is gray.