context: Chances are about even that Mary picked up the apple. There is a very good chance that John dropped the milk. We believe that Greg is gray. There is little chance that if Greg is gray, and John dropped the milk, then Sandra left the milk. It is impossible that if Mary picked up the apple, and John dropped the milk, then Brian is a rhino. It is probably the case that if Greg is gray, and Mary picked up the apple, then Emily is a mouse.
hypothesis: There is almost no chance that greg is gray, or Brian is a rhino.
valid_hypothesis: We believe that greg is gray, or Brian is a rhino.
invalid_hypothesis: There is almost no chance that greg is gray, or Brian is a rhino.
hypothesis_assertion: Greg is gray, or Brian is a rhino.