context: It is almost certain that Brian is a frog. It is almost certain that Bill is in the school. There is a very good chance that John discarded the milk. There is almost no chance that if John discarded the milk, and Bill is in the school, then Jeff went to the kitchen. It is improbable that if John discarded the milk, and Bill is in the school, then Bernhard is a swan. It is impossible that if Brian is a frog, or Bill is in the school, then Mary moved to the office.
hypothesis: It is almost certain that either Jeff went to the kitchen, or Brian is a frog.
valid_hypothesis: It is almost certain that either Jeff went to the kitchen, or Brian is a frog.
invalid_hypothesis: Chances are slight that either Jeff went to the kitchen, or Brian is a frog.
hypothesis_assertion: Either Jeff went to the kitchen, or Brian is a frog.