context: We doubt that John left the football. It is certain that Gertrude is a cat. We believe that Brian is a rhino. It is improbable that if either Brian is a rhino, or John left the football, then Mary took the apple. It is certain that if John left the football, or Brian is a rhino, then Bernhard is white. There is a better than even chance that if Brian is a rhino, and John left the football, then Greg is a swan.
hypothesis: It is certain that gertrude is a cat, or Bernhard is white.
valid_hypothesis: It is certain that gertrude is a cat, or Bernhard is white.
invalid_hypothesis: It is improbable that gertrude is a cat, or Bernhard is white.
hypothesis_assertion: Gertrude is a cat, or Bernhard is white.