context: Chances are slight that Sandra dropped the milk. It is almost certain that Lily is a swan. It is probably not the case that John went to the hallway.
hypothesis: It is probably the case that either Lily is a swan, or John went to the hallway.
valid_hypothesis: It is probably the case that either Lily is a swan, or John went to the hallway.
invalid_hypothesis: We doubt that either Lily is a swan, or John went to the hallway.
hypothesis_assertion: Either Lily is a swan, or John went to the hallway.