context: Chances are about even that Greg is a rhino. It is unlikely that Lily is a frog. There is a very good chance that Mary took the football.
hypothesis: Chances are about even that either Greg is a rhino, or Mary took the football.
valid_hypothesis: Chances are about even that either Greg is a rhino, or Mary took the football.
invalid_hypothesis: It is impossible that either Greg is a rhino, or Mary took the football.
hypothesis_assertion: Either Greg is a rhino, or Mary took the football.