context: Chances are about even that Greg is a rhino. It is probable that John moved to the garden. There is a better than even chance that Brian is a lion.
hypothesis: It is certain that either Brian is a lion, or Greg is a rhino.
valid_hypothesis: Chances are about even that either Brian is a lion, or Greg is a rhino.
invalid_hypothesis: It is certain that either Brian is a lion, or Greg is a rhino.
hypothesis_assertion: Either Brian is a lion, or Greg is a rhino.