context: There is a very good chance that John picked up the apple. It is probable that Brian is a rhino. There is little chance that Lily is a frog. There is a very good chance that if John picked up the apple, or Lily is a frog, then Fred is in the bedroom. It is highly unlikely that if Lily is a frog, or John picked up the apple, then Mary went to the office. It is unlikely that if either Brian is a rhino, or Lily is a frog, then Sandra got the milk.
hypothesis: It is improbable that either Brian is a rhino, or Mary went to the office.
valid_hypothesis: It is likely that either Brian is a rhino, or Mary went to the office.
invalid_hypothesis: It is improbable that either Brian is a rhino, or Mary went to the office.
hypothesis_assertion: Either Brian is a rhino, or Mary went to the office.