context: It is unlikely that Bill went to the cinema. Chances are slight that Fred discarded the milk. Chances are about even that Greg is a rhino.
hypothesis: It is impossible that either Greg is a rhino, or Fred discarded the milk.
valid_hypothesis: Chances are about even that either Greg is a rhino, or Fred discarded the milk.
invalid_hypothesis: It is impossible that either Greg is a rhino, or Fred discarded the milk.
hypothesis_assertion: Either Greg is a rhino, or Fred discarded the milk.