Schedule I Available Combinations(1) REMIC Securities MX Securities Class Original Class Principal Balance or Class Notional Balance Related MX Class Maximum Original Class Principal Balance or Class Notional Balance(2) Principal Type(3) Interest Rate Interest Type(3) CUSIP Number Final Distribution Date(4) Security Group 4 Combination 1 MA $  87,000,000 MB $  92,800,000 PAC/AD 3.75% FIX 38374EX A 0 March 2033 MF 5,800,000 MS 5,800,000 Combination 2 MA $  87,000,000 MC $  99,428,572 PAC/AD 4.00% FIX 38374EX B 8 March 2033 MF 12,428,572 MS 12,428,572 Combination 3 MA $  87,000,000 MD $107,076,923 PAC/AD 4.25% FIX 38374EX C 6 March 2033 MF 20,076,923 MS 20,076,923 Combination 4 MA $  87,000,000 ME $116,000,000 PAC/AD 4.50% FIX 38374EXD4 March 2033 MF 29,000,000 MS 29,000,000 Combination 5 MA $  87,000,000 MG $126,545,455 PAC/AD 4.75% FIX 38374EX E 2 March 2033 MF 39,545,455 MS 39,545,455 Combination 6 MA $  87,000,000 MH $139,200,000 PAC/AD 5.00% FIX 38374EX F 9 March 2033 MF 52,200,000 MS 52,200,000 Combination 7 MA $  87,000,000 MJ $174,000,000 PAC/AD 5.50% FIX 38374EXG7 March 2033 MF 87,000,000 MS 87,000,000 B-37