context: There is almost no chance that Mary went to the kitchen. We doubt that Greg is gray. There is little chance that Bernhard is a swan. It is improbable that if Greg is gray, or Mary went to the kitchen, then Brian is a frog. It is improbable that if Mary went to the kitchen, or Bernhard is a swan, then Lily is white. We believe that if either Bernhard is a swan, or Greg is gray, then John put down the apple.
hypothesis: We doubt that either Greg is gray, or Brian is a frog.
valid_hypothesis: We doubt that either Greg is gray, or Brian is a frog.
invalid_hypothesis: There is a very good chance that either Greg is gray, or Brian is a frog.
hypothesis_assertion: Either Greg is gray, or Brian is a frog.