context: It is improbable that John went to the kitchen. Chances are about even that Julius is green. There is a very good chance that Mary dropped the milk. We believe that if John went to the kitchen, and Julius is green, then Brian is gray. It is highly likely that if Julius is green, or Mary dropped the milk, then Bill moved to the office. There is almost no chance that if Julius is green, or Mary dropped the milk, then Emily is a mouse.
hypothesis: There is a very good chance that either Mary dropped the milk, or Brian is gray.
valid_hypothesis: There is a very good chance that either Mary dropped the milk, or Brian is gray.
invalid_hypothesis: There is almost no chance that either Mary dropped the milk, or Brian is gray.
hypothesis_assertion: Either Mary dropped the milk, or Brian is gray.