context: It is likely that Julius is white. It is certain that Greg is a rhino. Chances are about even that Sandra left the milk. It is highly likely that if Julius is white, or Greg is a rhino, then Daniel is in the garden. We doubt that if Greg is a rhino, and Julius is white, then Mary got the football. It is certain that if either Julius is white, or Sandra left the milk, then Fred went to the hallway.
hypothesis: There is a very good chance that sandra left the milk, and Fred went to the hallway.
valid_hypothesis: There is little chance that sandra left the milk, and Fred went to the hallway.
invalid_hypothesis: There is a very good chance that sandra left the milk, and Fred went to the hallway.
hypothesis_assertion: Sandra left the milk, and Fred went to the hallway.