The Merrill Lynch Puttable FLOATs/RITES Trust puttable floating option tax-exempt receipts series PT-677, relating to Travis County Health Facilities Development Corp. revenue bonds (Ascension Health Credit Group) series 1999A, is rated 'AAA/A-1+'. The long-term component of the rating is based on the MBIA-insured underlying bond. The short-term component of the rating is based on a liquidity LOC guarantee from Svenska Handelsbanken AB, and the expiration date of the liquidity facility is Sept. 15, 2003.