context: Chances are about even that Sandra got the milk. It is impossible that Bernhard is a rhino. It is almost certain that Fred went to the cinema. It is unlikely that if Sandra got the milk, or Fred went to the cinema, then Brian is a frog. We believe that if Fred went to the cinema, and Sandra got the milk, then Greg is a lion. We doubt that if either Bernhard is a rhino, or Fred went to the cinema, then John picked up the apple.
hypothesis: It is certain that either Bernhard is a rhino, or Brian is a frog.
valid_hypothesis: We doubt that either Bernhard is a rhino, or Brian is a frog.
invalid_hypothesis: It is certain that either Bernhard is a rhino, or Brian is a frog.
hypothesis_assertion: Either Bernhard is a rhino, or Brian is a frog.