context: Chances are about even that John left the football. Chances are slight that Greg is a lion. We doubt that Mary moved to the garden.
hypothesis: It is almost certain that either Greg is a lion, or Mary moved to the garden.
valid_hypothesis: It is probably not the case that either Greg is a lion, or Mary moved to the garden.
invalid_hypothesis: It is almost certain that either Greg is a lion, or Mary moved to the garden.
hypothesis_assertion: Either Greg is a lion, or Mary moved to the garden.