context: It is unlikely that Sandra dropped the apple. Chances are about even that Greg is a lion. It is certain that Brian is a swan.
hypothesis: There is almost no chance that either Brian is a swan, or Greg is a lion.
valid_hypothesis: Chances are about even that either Brian is a swan, or Greg is a lion.
invalid_hypothesis: There is almost no chance that either Brian is a swan, or Greg is a lion.
hypothesis_assertion: Either Brian is a swan, or Greg is a lion.