context: Chances are about even that Brian is a frog. Chances are about even that John dropped the milk. Chances are about even that Julius is a swan. It is highly likely that if either Brian is a frog, or Julius is a swan, then Fred is in the office. It is probably the case that if John dropped the milk, and Julius is a swan, then Lily is gray. It is highly likely that if John dropped the milk, and Brian is a frog, then Mary left the apple.
hypothesis: We believe that john dropped the milk, or Brian is a frog.
valid_hypothesis: We believe that john dropped the milk, or Brian is a frog.
invalid_hypothesis: It is improbable that john dropped the milk, or Brian is a frog.
hypothesis_assertion: John dropped the milk, or Brian is a frog.