context: It is probably the case that Brian is a rhino. Chances are about even that Mary left the milk. It is almost certain that Lily is white. It is unlikely that if either Mary left the milk, or Brian is a rhino, then Julius is a frog. It is impossible that if either Mary left the milk, or Brian is a rhino, then Bernhard is gray. There is almost no chance that if Mary left the milk, or Lily is white, then Fred dropped the apple.
hypothesis: Chances are about even that either Fred dropped the apple, or Mary left the milk.
valid_hypothesis: Chances are about even that either Fred dropped the apple, or Mary left the milk.
invalid_hypothesis: It is almost certain that either Fred dropped the apple, or Mary left the milk.
hypothesis_assertion: Either Fred dropped the apple, or Mary left the milk.