context: There is little chance that Brian is a swan. It is likely that Greg is a frog. There is little chance that Daniel left the apple. It is likely that if either Brian is a swan, or Daniel left the apple, then Mary put down the milk. It is unlikely that if Greg is a frog, and Daniel left the apple, then John moved to the garden. It is highly likely that if Daniel left the apple, or Greg is a frog, then Lily is yellow.
hypothesis: It is unlikely that either Brian is a swan, or Daniel left the apple.
valid_hypothesis: It is unlikely that either Brian is a swan, or Daniel left the apple.
invalid_hypothesis: It is certain that either Brian is a swan, or Daniel left the apple.
hypothesis_assertion: Either Brian is a swan, or Daniel left the apple.