context: There is a better than even chance that John discarded the milk. It is certain that Brian is a frog. Chances are slight that Bernhard is a rhino. Chances are about even that if either Brian is a frog, or Bernhard is a rhino, then Lily is a swan. It is highly unlikely that if Bernhard is a rhino, and John discarded the milk, then Greg is yellow. It is probably the case that if Bernhard is a rhino, and Brian is a frog, then Mary went to the office.
hypothesis: There is a better than even chance that either Lily is a swan, or Brian is a frog.
valid_hypothesis: There is a better than even chance that either Lily is a swan, or Brian is a frog.
invalid_hypothesis: There is little chance that either Lily is a swan, or Brian is a frog.
hypothesis_assertion: Either Lily is a swan, or Brian is a frog.