All communications hereunder shall be in writing and, if sent to the Initial Purchasers, shall be mailed or delivered to Merrill Lynch, Pierce, Fenner & Smith Incorporated at One Bryant Park, New York, New York 10036, Attention: High Yield Legal Department, Facsimile: (212) 901-7897; and if sent to the Partnership, shall be mailed or delivered to the Partnership at 1000 Louisiana Street, Suite 4300, Houston, Texas 77002, Attention: Chief Financial Officer; with a copy to Vinson & Elkins L.L.P., 1001 Fannin Street, Suite 2500, Houston, Texas 77002, Attention: Christopher S. Collins.