context: It is probably not the case that John went to the garden. It is highly likely that Mary discarded the milk. Chances are about even that Julius is a rhino. It is probable that if John went to the garden, and Julius is a rhino, then Gertrude is a wolf. It is probably the case that if Julius is a rhino, and John went to the garden, then Winona is a mouse. Chances are about even that if Mary discarded the milk, and John went to the garden, then Daniel got the football.
hypothesis: It is impossible that either John went to the garden, or Julius is a rhino.
valid_hypothesis: Chances are about even that either John went to the garden, or Julius is a rhino.
invalid_hypothesis: It is impossible that either John went to the garden, or Julius is a rhino.
hypothesis_assertion: Either John went to the garden, or Julius is a rhino.