context: We believe that Bernhard is a lion. Chances are about even that Brian is a rhino. There is almost no chance that Sandra left the football.
hypothesis: It is impossible that either Brian is a rhino, or Sandra left the football.
valid_hypothesis: Chances are about even that either Brian is a rhino, or Sandra left the football.
invalid_hypothesis: It is impossible that either Brian is a rhino, or Sandra left the football.
hypothesis_assertion: Either Brian is a rhino, or Sandra left the football.