context: It is probable that Brian is gray. It is probably the case that Lily is a lion. Chances are about even that Mary went to the kitchen.
hypothesis: It is certain that either Mary went to the kitchen, or Brian is gray.
valid_hypothesis: Chances are about even that either Mary went to the kitchen, or Brian is gray.
invalid_hypothesis: It is certain that either Mary went to the kitchen, or Brian is gray.
hypothesis_assertion: Either Mary went to the kitchen, or Brian is gray.