context: We doubt that Brian is a lion. Chances are about even that Mary dropped the milk. It is likely that Julius is a swan. It is highly unlikely that if either Brian is a lion, or Mary dropped the milk, then Fred moved to the office. Chances are slight that if either Julius is a swan, or Mary dropped the milk, then Bernhard is a rhino. It is almost certain that if Brian is a lion, or Mary dropped the milk, then John went to the garden.
hypothesis: It is impossible that either Bernhard is a rhino, or John went to the garden.
valid_hypothesis: There is a better than even chance that either Bernhard is a rhino, or John went to the garden.
invalid_hypothesis: It is impossible that either Bernhard is a rhino, or John went to the garden.
hypothesis_assertion: Either Bernhard is a rhino, or John went to the garden.