context: It is highly unlikely that Sandra left the apple. It is likely that Greg is a rhino. It is likely that Lily is a frog. Chances are about even that if either Greg is a rhino, or Sandra left the apple, then Julius is gray. It is unlikely that if either Greg is a rhino, or Lily is a frog, then Mary grabbed the milk. We doubt that if Lily is a frog, or Greg is a rhino, then Brian is a lion.
hypothesis: We believe that lily is a frog, or Mary grabbed the milk.
valid_hypothesis: We believe that lily is a frog, or Mary grabbed the milk.
invalid_hypothesis: Chances are slight that lily is a frog, or Mary grabbed the milk.
hypothesis_assertion: Lily is a frog, or Mary grabbed the milk.