context: It is probable that Gertrude is a mouse. It is unlikely that Brian is a swan. It is almost certain that Greg is gray. It is highly likely that if either Gertrude is a mouse, or Greg is gray, then Lily is a frog. It is probably not the case that if either Greg is gray, or Brian is a swan, then Mary went to the garden. It is highly likely that if Gertrude is a mouse, or Greg is gray, then Julius is a rhino.
hypothesis: Chances are about even that either Brian is a swan, or Mary went to the garden.
valid_hypothesis: Chances are about even that either Brian is a swan, or Mary went to the garden.
invalid_hypothesis: It is certain that either Brian is a swan, or Mary went to the garden.
hypothesis_assertion: Either Brian is a swan, or Mary went to the garden.