context: There is a better than even chance that Brian is a swan. There is almost no chance that John discarded the milk. It is unlikely that Jeff dropped the apple. Chances are about even that if John discarded the milk, or Brian is a swan, then Greg is gray. It is probable that if Brian is a swan, and Jeff dropped the apple, then Mary moved to the garden. It is almost certain that if John discarded the milk, or Jeff dropped the apple, then Lily is a frog.
hypothesis: There is little chance that either Jeff dropped the apple, or Mary moved to the garden.
valid_hypothesis: There is little chance that either Jeff dropped the apple, or Mary moved to the garden.
invalid_hypothesis: It is probably the case that either Jeff dropped the apple, or Mary moved to the garden.
hypothesis_assertion: Either Jeff dropped the apple, or Mary moved to the garden.