context: It is unlikely that Sandra took the milk. We doubt that Bernhard is gray. We believe that Mary moved to the office. Chances are slight that if Bernhard is gray, and Sandra took the milk, then Greg is a lion. It is likely that if Mary moved to the office, and Bernhard is gray, then Lily is a rhino. It is probable that if either Bernhard is gray, or Mary moved to the office, then Julius is yellow.
hypothesis: We believe that either Greg is a lion, or Mary moved to the office.
valid_hypothesis: We believe that either Greg is a lion, or Mary moved to the office.
invalid_hypothesis: There is little chance that either Greg is a lion, or Mary moved to the office.
hypothesis_assertion: Either Greg is a lion, or Mary moved to the office.