context: Chances are about even that Daniel grabbed the milk. It is impossible that Winona is a sheep. It is impossible that Greg is a swan. There is little chance that if either Greg is a swan, or Winona is a sheep, then John got the apple. It is impossible that if either Daniel grabbed the milk, or Greg is a swan, then Mary went to the kitchen. There is a better than even chance that if Greg is a swan, and Daniel grabbed the milk, then Lily is green.
hypothesis: It is impossible that winona is a sheep, and Mary went to the kitchen.
valid_hypothesis: It is impossible that winona is a sheep, and Mary went to the kitchen.
invalid_hypothesis: Chances are about even that winona is a sheep, and Mary went to the kitchen.
hypothesis_assertion: Winona is a sheep, and Mary went to the kitchen.