context: It is certain that John left the apple. It is unlikely that Lily is a lion. There is a very good chance that Julius is a rhino. There is little chance that if Julius is a rhino, or John left the apple, then Brian is a swan. It is likely that if either Julius is a rhino, or Lily is a lion, then Fred went to the bedroom. It is likely that if either Julius is a rhino, or Lily is a lion, then Mary is in the garden.
hypothesis: There is almost no chance that either John left the apple, or Mary is in the garden.
valid_hypothesis: Chances are about even that either John left the apple, or Mary is in the garden.
invalid_hypothesis: There is almost no chance that either John left the apple, or Mary is in the garden.
hypothesis_assertion: Either John left the apple, or Mary is in the garden.