context: It is probably not the case that Julius is white. Chances are about even that Mary dropped the milk. It is highly likely that Sandra left the football. It is certain that if Sandra left the football, and Mary dropped the milk, then Gertrude is a mouse. It is probably the case that if Julius is white, or Mary dropped the milk, then Brian is a rhino. It is unlikely that if Julius is white, or Sandra left the football, then John went to the office.
hypothesis: Chances are about even that sandra left the football, and Brian is a rhino.
valid_hypothesis: Chances are about even that sandra left the football, and Brian is a rhino.
invalid_hypothesis: It is certain that sandra left the football, and Brian is a rhino.
hypothesis_assertion: Sandra left the football, and Brian is a rhino.