context: Chances are slight that Greg is a swan. It is highly unlikely that John dropped the milk. We doubt that Lily is green.
hypothesis: It is probably not the case that either Lily is green, or John dropped the milk.
valid_hypothesis: It is probably not the case that either Lily is green, or John dropped the milk.
invalid_hypothesis: There is a very good chance that either Lily is green, or John dropped the milk.
hypothesis_assertion: Either Lily is green, or John dropped the milk.