context: Chances are slight that John went to the bedroom. We believe that Julius is green. It is highly unlikely that Lily is a frog. Chances are about even that if Lily is a frog, or Julius is green, then Brian is a lion. It is probably the case that if either John went to the bedroom, or Julius is green, then Bernhard is a rhino. It is probable that if either John went to the bedroom, or Julius is green, then Mary moved to the garden.
hypothesis: It is certain that either Mary moved to the garden, or Brian is a lion.
valid_hypothesis: Chances are about even that either Mary moved to the garden, or Brian is a lion.
invalid_hypothesis: It is certain that either Mary moved to the garden, or Brian is a lion.
hypothesis_assertion: Either Mary moved to the garden, or Brian is a lion.