context: Chances are about even that Sandra took the milk. It is certain that Lily is a frog. It is unlikely that Mary went to the bedroom. It is probable that if Mary went to the bedroom, and Lily is a frog, then Fred dropped the apple. It is likely that if either Mary went to the bedroom, or Sandra took the milk, then Julius is yellow. It is certain that if Lily is a frog, or Mary went to the bedroom, then Brian is a swan.
hypothesis: Chances are about even that either Sandra took the milk, or Lily is a frog.
valid_hypothesis: Chances are about even that either Sandra took the milk, or Lily is a frog.
invalid_hypothesis: There is almost no chance that either Sandra took the milk, or Lily is a frog.
hypothesis_assertion: Either Sandra took the milk, or Lily is a frog.