context: It is probable that John went to the hallway. It is improbable that Sandra took the milk. We doubt that Fred is in the kitchen. There is little chance that if Fred is in the kitchen, and Sandra took the milk, then Lily is white. It is unlikely that if John went to the hallway, and Fred is in the kitchen, then Julius is a swan. It is improbable that if Fred is in the kitchen, and John went to the hallway, then Mary moved to the garden.
hypothesis: There is a very good chance that either Lily is white, or Julius is a swan.
valid_hypothesis: There is almost no chance that either Lily is white, or Julius is a swan.
invalid_hypothesis: There is a very good chance that either Lily is white, or Julius is a swan.
hypothesis_assertion: Either Lily is white, or Julius is a swan.