context: We believe that Greg is a lion. It is impossible that Mary put down the milk. It is almost certain that Winona is a wolf. Chances are about even that if Greg is a lion, or Mary put down the milk, then Bernhard is a rhino. There is little chance that if Winona is a wolf, and Greg is a lion, then Lily is a frog. There is a very good chance that if Winona is a wolf, or Mary put down the milk, then Brian is a swan.
hypothesis: We believe that either Mary put down the milk, or Brian is a swan.
valid_hypothesis: We believe that either Mary put down the milk, or Brian is a swan.
invalid_hypothesis: Chances are slight that either Mary put down the milk, or Brian is a swan.
hypothesis_assertion: Either Mary put down the milk, or Brian is a swan.