context: It is certain that Greg is a swan. It is probably not the case that Julius is a rhino. There is a very good chance that Mary dropped the milk. Chances are slight that if Julius is a rhino, or Mary dropped the milk, then Daniel took the football. It is improbable that if either Mary dropped the milk, or Greg is a swan, then Gertrude is a mouse. It is impossible that if Mary dropped the milk, and Julius is a rhino, then Bernhard is yellow.
hypothesis: There is little chance that either Greg is a swan, or Gertrude is a mouse.
valid_hypothesis: It is certain that either Greg is a swan, or Gertrude is a mouse.
invalid_hypothesis: There is little chance that either Greg is a swan, or Gertrude is a mouse.
hypothesis_assertion: Either Greg is a swan, or Gertrude is a mouse.