context: It is certain that John went to the bedroom. We believe that Fred left the milk. It is probably the case that Mary got the football. There is a better than even chance that if Fred left the milk, or Mary got the football, then Brian is a frog. Chances are about even that if Fred left the milk, or Mary got the football, then Greg is green. There is a very good chance that if Mary got the football, and Fred left the milk, then Bernhard is a swan.
hypothesis: We believe that greg is green, or Brian is a frog.
valid_hypothesis: We believe that greg is green, or Brian is a frog.
invalid_hypothesis: There is little chance that greg is green, or Brian is a frog.
hypothesis_assertion: Greg is green, or Brian is a frog.