Merrill Lynch Puttable FLOATs/RITES Trust puttable floating option tax-exempt receipts series PT-3621, relating to Massachusetts Health and Educational Facilities Authority revenue bonds, Harvard University issue series 2005B and 2005C, are rated 'AAA/A-1'. The long-term component of the rating is based on the underlying bond. The short-term component of the rating is based on a liquidity facility from Merrill Lynch Capital Services (NR) and a liquidity guarantee from Merrill Lynch&Co. Inc. (A-1). The expiration date of the liquidity facility is Sept. 15, 2007. Merrill Lynch Puttable FLOATs/RITES Trust residual interest tax-exempt receipts series PT-3621, relating to Massachusetts Health and Educational Facilities Authority revenue bonds, Harvard University issue series 2005B and 2005C, are rated 'AAA'. The long-term rating is based
