context: It is impossible that Greg is a lion. There is a very good chance that Mary put down the milk. It is almost certain that Lily is a swan. There is almost no chance that if either Lily is a swan, or Greg is a lion, then Brian is white. There is almost no chance that if Greg is a lion, and Mary put down the milk, then John moved to the garden. Chances are about even that if Greg is a lion, or Mary put down the milk, then Bernhard is green.
hypothesis: There is little chance that either Lily is a swan, or Brian is white.
valid_hypothesis: It is almost certain that either Lily is a swan, or Brian is white.
invalid_hypothesis: There is little chance that either Lily is a swan, or Brian is white.
hypothesis_assertion: Either Lily is a swan, or Brian is white.