Merrill Lynch Puttable FLOATs/RITES Trust puttable floating option tax-exempt receipts series PT-4283, relating to Pennsylvania Housing Finance Agency single family mortgage revenue bonds series 2007-97A, are rated 'AA+/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 guarantee from Merrill Lynch&Co. Inc. expiring July 15, 2008. Merrill Lynch Puttable FLOATs/RITES Trust residual interest tax-exempt receipts series PT-4283, relating to Pennsylvania Housing Finance Agency single family mortgage revenue bonds series 2007-97A, are rated 'AA+'. The long-term rating is based on the underlying bond.