context: It is probably not the case that Julius is gray. There is a better than even chance that Mary got the milk. There is almost no chance that Brian is a swan. It is probably not the case that if Julius is gray, and Brian is a swan, then Greg is a rhino. Chances are about even that if either Julius is gray, or Brian is a swan, then Bernhard is white. There is a very good chance that if Brian is a swan, and Mary got the milk, then John took the apple.
hypothesis: It is improbable that either Mary got the milk, or Brian is a swan.
valid_hypothesis: There is a better than even chance that either Mary got the milk, or Brian is a swan.
invalid_hypothesis: It is improbable that either Mary got the milk, or Brian is a swan.
hypothesis_assertion: Either Mary got the milk, or Brian is a swan.