context: It is probable that Jessica is a mouse. It is probably not the case that Greg is a swan. Chances are about even that John dropped the milk.
hypothesis: It is highly unlikely that either John dropped the milk, or Greg is a swan.
valid_hypothesis: Chances are about even that either John dropped the milk, or Greg is a swan.
invalid_hypothesis: It is highly unlikely that either John dropped the milk, or Greg is a swan.
hypothesis_assertion: Either John dropped the milk, or Greg is a swan.