context: It is impossible that Greg is a swan. It is probably the case that Mary moved to the office. There is almost no chance that Fred dropped the apple. There is almost no chance that if either Greg is a swan, or Fred dropped the apple, then Winona is a wolf. It is probable that if Greg is a swan, or Fred dropped the apple, then Emily is a sheep. It is improbable that if Greg is a swan, or Fred dropped the apple, then John left the football.
hypothesis: It is impossible that either John left the football, or Winona is a wolf.
valid_hypothesis: It is impossible that either John left the football, or Winona is a wolf.
invalid_hypothesis: There is a better than even chance that either John left the football, or Winona is a wolf.
hypothesis_assertion: Either John left the football, or Winona is a wolf.