context: It is unlikely that Daniel put down the milk. It is impossible that Julius is a swan. There is a very good chance that Greg is green. Chances are about even that if either Greg is green, or Daniel put down the milk, then Sandra took the football. It is improbable that if Greg is green, and Julius is a swan, then John is in the hallway. It is highly unlikely that if Greg is green, and Daniel put down the milk, then Jeff dropped the apple.
hypothesis: Chances are about even that either Greg is green, or Sandra took the football.
valid_hypothesis: Chances are about even that either Greg is green, or Sandra took the football.
invalid_hypothesis: It is almost certain that either Greg is green, or Sandra took the football.
hypothesis_assertion: Either Greg is green, or Sandra took the football.