In such instances, the Service's request must be supported by testimony of a Postal Service witness that explains the rationale for the proposed multi-year test period.
The Service's request must be supported by the testimony of a Postal Service witness.
mnli hypothesis: The Service's request must be supported by the testimony of a Postal Service witness. premise: In such instances, the Service's request must be supported by testimony of a Postal Service witness that explains the rationale for the proposed multi-year test period.