The rating on the four series of bonds, issued on behalf of Trinity Health, Mich., is based on the ratings of Trinity Health ('AA-') and separate standby bond purchase agreements (SBPA) for each series, provided severally by banks rated 'A-1+' in the short-term by Standard&Poor's. The series 2000C SBPA is issued severally by Landesbank Hessen-Thueringen Girozentrale and Chase Manhattan Bank. The series 2000D SBPA is provided only by Morgan Guaranty Trust Co. Morgan Guaranty Trust Co. of New York, Chase Manhattan Bank, and Northern Trust Co. are severally issuing the SBPA for the series 2000E bonds. Morgan Guaranty Trust Co. and Bayerische Landesbank Girozentrale are severally issuing the SBPA for the series 2000F bonds. The short-term rating is