context: It is probable that Greg is a swan. It is certain that Mary went to the bedroom. We doubt that Winona is a sheep.
hypothesis: It is impossible that either Greg is a swan, or Winona is a sheep.
valid_hypothesis: There is a better than even chance that either Greg is a swan, or Winona is a sheep.
invalid_hypothesis: It is impossible that either Greg is a swan, or Winona is a sheep.
hypothesis_assertion: Either Greg is a swan, or Winona is a sheep.