context: It is certain that John picked up the milk. There is little chance that Bernhard is a swan. It is improbable that Greg is a rhino. It is unlikely that if Bernhard is a swan, or John picked up the milk, then Daniel dropped the apple. Chances are slight that if Bernhard is a swan, or Greg is a rhino, then Lily is green. There is a very good chance that if either Greg is a rhino, or Bernhard is a swan, then Fred went to the kitchen.
hypothesis: There is a very good chance that either Greg is a rhino, or Bernhard is a swan.
valid_hypothesis: We doubt that either Greg is a rhino, or Bernhard is a swan.
invalid_hypothesis: There is a very good chance that either Greg is a rhino, or Bernhard is a swan.
hypothesis_assertion: Either Greg is a rhino, or Bernhard is a swan.