context: It is improbable that Brian is a swan. It is unlikely that Greg is a lion. There is a very good chance that Jessica is a mouse. Chances are about even that if Brian is a swan, or Greg is a lion, then Lily is a frog. It is certain that if either Brian is a swan, or Jessica is a mouse, then Mary went to the garden. It is likely that if Greg is a lion, or Jessica is a mouse, then Bernhard is a frog.
hypothesis: There is a better than even chance that either Greg is a lion, or Mary went to the garden.
valid_hypothesis: There is a better than even chance that either Greg is a lion, or Mary went to the garden.
invalid_hypothesis: Chances are slight that either Greg is a lion, or Mary went to the garden.
hypothesis_assertion: Either Greg is a lion, or Mary went to the garden.