context: It is probable that Yann is tired. There is little chance that Jessica is a sheep. It is almost certain that John put down the apple. Chances are about even that if Jessica is a sheep, and Yann is tired, then Brian is a swan. It is probably the case that if Jessica is a sheep, and John put down the apple, then Sandra grabbed the milk. It is probably the case that if John put down the apple, and Jessica is a sheep, then Lily is a lion.
hypothesis: It is highly unlikely that either Sandra grabbed the milk, or Lily is a lion.
valid_hypothesis: It is highly unlikely that either Sandra grabbed the milk, or Lily is a lion.
invalid_hypothesis: There is a better than even chance that either Sandra grabbed the milk, or Lily is a lion.
hypothesis_assertion: Either Sandra grabbed the milk, or Lily is a lion.