context: It is certain that Greg is a lion. It is likely that Bernhard is a swan. We believe that John went to the bedroom. Chances are slight that if John went to the bedroom, and Bernhard is a swan, then Brian is white. We believe that if either Bernhard is a swan, or John went to the bedroom, then Julius is a lion. We doubt that if either Greg is a lion, or Bernhard is a swan, then Mary picked up the milk.
hypothesis: It is unlikely that either Bernhard is a swan, or Mary picked up the milk.
valid_hypothesis: We believe that either Bernhard is a swan, or Mary picked up the milk.
invalid_hypothesis: It is unlikely that either Bernhard is a swan, or Mary picked up the milk.
hypothesis_assertion: Either Bernhard is a swan, or Mary picked up the milk.