context: We doubt that Bernhard is a lion. It is unlikely that Lily is a swan. We believe that Brian is a frog. We believe that if Brian is a frog, or Bernhard is a lion, then Greg is gray. Chances are about even that if either Brian is a frog, or Lily is a swan, then Mary went to the office. It is probable that if Brian is a frog, or Bernhard is a lion, then John is in the bedroom.
hypothesis: Chances are about even that either Brian is a frog, or Mary went to the office.
valid_hypothesis: Chances are about even that either Brian is a frog, or Mary went to the office.
invalid_hypothesis: It is highly unlikely that either Brian is a frog, or Mary went to the office.
hypothesis_assertion: Either Brian is a frog, or Mary went to the office.