context: Chances are about even that Brian is a swan. There is almost no chance that Jeff went to the garden. It is likely that Sandra grabbed the milk. Chances are about even that if either Sandra grabbed the milk, or Jeff went to the garden, then Julius is gray. It is improbable that if either Brian is a swan, or Sandra grabbed the milk, then Greg is a frog. Chances are about even that if either Jeff went to the garden, or Brian is a swan, then Mary took the apple.
hypothesis: It is certain that either Julius is gray, or Greg is a frog.
valid_hypothesis: It is probably not the case that either Julius is gray, or Greg is a frog.
invalid_hypothesis: It is certain that either Julius is gray, or Greg is a frog.
hypothesis_assertion: Either Julius is gray, or Greg is a frog.