context: It is probable that Brian is yellow. We believe that John got the football. There is almost no chance that Greg is a frog. It is highly likely that if Brian is yellow, or Greg is a frog, then Bernhard is white. It is probable that if John got the football, and Greg is a frog, then Sandra grabbed the milk. It is probable that if John got the football, and Brian is yellow, then Mary moved to the office.
hypothesis: We believe that either John got the football, or Sandra grabbed the milk.
valid_hypothesis: We believe that either John got the football, or Sandra grabbed the milk.
invalid_hypothesis: There is almost no chance that either John got the football, or Sandra grabbed the milk.
hypothesis_assertion: Either John got the football, or Sandra grabbed the milk.