context: Chances are about even that Brian is gray. We doubt that Sandra left the milk. It is highly unlikely that Bernhard is a lion. It is highly unlikely that if Bernhard is a lion, and Sandra left the milk, then John went to the garden. It is probably not the case that if either Bernhard is a lion, or Sandra left the milk, then Greg is yellow. Chances are about even that if Bernhard is a lion, and Brian is gray, then Mary moved to the office.
hypothesis: There is a very good chance that greg is yellow, and Sandra left the milk.
valid_hypothesis: It is highly unlikely that greg is yellow, and Sandra left the milk.
invalid_hypothesis: There is a very good chance that greg is yellow, and Sandra left the milk.
hypothesis_assertion: Greg is yellow, and Sandra left the milk.