context: It is almost certain that Brian is a lion. We doubt that Mary is in the school. It is almost certain that John went to the kitchen. It is probably not the case that if either Brian is a lion, or John went to the kitchen, then Sandra took the milk. It is highly likely that if Brian is a lion, and John went to the kitchen, then Julius is a frog. It is highly likely that if Mary is in the school, or Brian is a lion, then Bernhard is white.
hypothesis: There is little chance that either Sandra took the milk, or John went to the kitchen.
valid_hypothesis: It is almost certain that either Sandra took the milk, or John went to the kitchen.
invalid_hypothesis: There is little chance that either Sandra took the milk, or John went to the kitchen.
hypothesis_assertion: Either Sandra took the milk, or John went to the kitchen.