context: It is certain that Greg is gray. It is probably the case that Lily is a lion. There is almost no chance that Brian is green. We believe that if Greg is gray, and Lily is a lion, then Daniel took the milk. It is unlikely that if Greg is gray, or Lily is a lion, then Mary went to the office. It is unlikely that if Lily is a lion, and Greg is gray, then John dropped the apple.
hypothesis: There is almost no chance that either Brian is green, or Daniel took the milk.
valid_hypothesis: Chances are about even that either Brian is green, or Daniel took the milk.
invalid_hypothesis: There is almost no chance that either Brian is green, or Daniel took the milk.
hypothesis_assertion: Either Brian is green, or Daniel took the milk.