IRS  IRS Faces Challenges as it Restructures the Office of the Taxpayer Advocate ( GAO/GGD-99-124, July 15, 1999).
The IRS faces a challenge.
mnli hypothesis: The IRS faces a challenge. premise: IRS  IRS Faces Challenges as it Restructures the Office of the Taxpayer Advocate ( GAO/GGD-99-124, July 15, 1999).