context: It is probably the case that Greg is a swan. There is a very good chance that Julius is yellow. There is little chance that Mary dropped the milk. We believe that if Greg is a swan, or Julius is yellow, then Winona is a cat. It is improbable that if Mary dropped the milk, or Greg is a swan, then John moved to the garden. Chances are about even that if Mary dropped the milk, and Julius is yellow, then Fred went to the kitchen.
hypothesis: Chances are slight that greg is a swan, or Mary dropped the milk.
valid_hypothesis: We believe that greg is a swan, or Mary dropped the milk.
invalid_hypothesis: Chances are slight that greg is a swan, or Mary dropped the milk.
hypothesis_assertion: Greg is a swan, or Mary dropped the milk.