context: It is almost certain that Mary went to the bedroom. It is probably the case that Sandra left the milk. We believe that Bernhard is a lion. Chances are about even that if either Bernhard is a lion, or Mary went to the bedroom, then Greg is a frog. It is unlikely that if Mary went to the bedroom, and Bernhard is a lion, then Brian is white. It is almost certain that if Sandra left the milk, or Mary went to the bedroom, then Julius is gray.
hypothesis: It is certain that either Mary went to the bedroom, or Sandra left the milk.
valid_hypothesis: It is probably not the case that either Mary went to the bedroom, or Sandra left the milk.
invalid_hypothesis: It is certain that either Mary went to the bedroom, or Sandra left the milk.
hypothesis_assertion: Either Mary went to the bedroom, or Sandra left the milk.