Text: From a procedural perspective, the legal soundness of rate or mail classification changes by contract alone is doubtful because the only means of making such changes recognized in the Reorganization Act are the procedures prescribed in Chapter 36 of Title 39.
Entailment: Rate changes on the basis of a contract aren't likely to be legal.
Contradiction: Chapter 36 of Title 39 isn't the only way that rate changes can receive legal recognition.