context: It is certain that Greg is a swan. It is probably not the case that Mary went to the kitchen. It is improbable that John put down the apple. It is probably the case that if either Mary went to the kitchen, or John put down the apple, then Julius is gray. It is certain that if either Greg is a swan, or John put down the apple, then Bill dropped the milk. There is a very good chance that if John put down the apple, and Mary went to the kitchen, then Lily is white.
hypothesis: It is improbable that john put down the apple, and Greg is a swan.
valid_hypothesis: It is improbable that john put down the apple, and Greg is a swan.
invalid_hypothesis: We believe that john put down the apple, and Greg is a swan.
hypothesis_assertion: John put down the apple, and Greg is a swan.