context: Chances are about even that Lily is green. It is highly unlikely that Fred dropped the apple. It is highly likely that John put down the apple. There is little chance that if John put down the apple, and Fred dropped the apple, then Mary went to the kitchen. There is almost no chance that if Lily is green, and Fred dropped the apple, then Brian is a swan. There is a better than even chance that if Lily is green, or John put down the apple, then Bernhard is gray.
hypothesis: It is highly likely that either Fred dropped the apple, or John put down the apple.
valid_hypothesis: It is highly likely that either Fred dropped the apple, or John put down the apple.
invalid_hypothesis: It is improbable that either Fred dropped the apple, or John put down the apple.
hypothesis_assertion: Either Fred dropped the apple, or John put down the apple.