context: Chances are slight that Julius is green. There is almost no chance that Mary moved to the garden. It is probably not the case that Sandra grabbed the milk. It is probably not the case that if Sandra grabbed the milk, or Julius is green, then Greg is gray. Chances are slight that if Julius is green, or Sandra grabbed the milk, then Bernhard is a swan. We believe that if Mary moved to the garden, or Julius is green, then Fred is in the school.
hypothesis: It is improbable that fred is in the school, or Mary moved to the garden.
valid_hypothesis: It is improbable that fred is in the school, or Mary moved to the garden.
invalid_hypothesis: It is certain that fred is in the school, or Mary moved to the garden.
hypothesis_assertion: Fred is in the school, or Mary moved to the garden.