context: Chances are about even that Gertrude is a mouse. Chances are slight that John went to the hallway. It is almost certain that Mary got the apple. We doubt that if John went to the hallway, or Mary got the apple, then Brian is a swan. We doubt that if Gertrude is a mouse, or John went to the hallway, then Bernhard is a lion. It is impossible that if John went to the hallway, and Mary got the apple, then Lily is a rhino.
hypothesis: It is unlikely that either Bernhard is a lion, or John went to the hallway.
valid_hypothesis: It is unlikely that either Bernhard is a lion, or John went to the hallway.
invalid_hypothesis: It is probably the case that either Bernhard is a lion, or John went to the hallway.
hypothesis_assertion: Either Bernhard is a lion, or John went to the hallway.