context: It is probably not the case that Greg is gray. It is impossible that Mary went to the kitchen. We doubt that Lily is a lion. Chances are slight that if Lily is a lion, and Mary went to the kitchen, then Sandra grabbed the milk. It is almost certain that if Mary went to the kitchen, and Greg is gray, then Julius is white. Chances are slight that if Mary went to the kitchen, or Lily is a lion, then Bernhard is a swan.
hypothesis: It is impossible that either Sandra grabbed the milk, or Julius is white.
valid_hypothesis: It is impossible that either Sandra grabbed the milk, or Julius is white.
invalid_hypothesis: It is almost certain that either Sandra grabbed the milk, or Julius is white.
hypothesis_assertion: Either Sandra grabbed the milk, or Julius is white.