context: It is highly unlikely that Jeff went to the kitchen. It is probably not the case that Mary got the football. Chances are about even that Brian is white. It is probably the case that if Mary got the football, and Brian is white, then Lily is a frog. It is highly unlikely that if Mary got the football, or Jeff went to the kitchen, then John picked up the milk. It is highly likely that if Brian is white, and Mary got the football, then Bernhard is a swan.
hypothesis: There is almost no chance that mary got the football, and Jeff went to the kitchen.
valid_hypothesis: There is almost no chance that mary got the football, and Jeff went to the kitchen.
invalid_hypothesis: It is probably the case that mary got the football, and Jeff went to the kitchen.
hypothesis_assertion: Mary got the football, and Jeff went to the kitchen.