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 2 Combination 1(5) LA $   20,000,000 IL $  12,000,000 NTL(PAC) 5.00%    FIX/IO 38374BH71 September 2021 LH 20,000,000 PAC 2.00 FIX 38374BH89 September 2021 LJ 20,000,000 PAC 2.25 FIX 38374BH97 September 2021 LK 20,000,000 PAC 2.50 FIX 38374BJ20 September 2021 LM 20,000,000 PAC 3.00 FIX 38374BJ38 September 2021 LN 20,000,000 PAC 3.50 FIX 38374BJ46 September 2021 LT 20,000,000 PAC 4.00 FIX 38374BJ53 September 2021 LU 20,000,000 PAC 4.50 FIX 38374BJ61 September 2021 Combination 2(5) LB $  51,400,000 BC $  51,400,000 PAC 2.00% FIX 38374BJ79 September 2026 BD 51,400,000 PAC 2.25 FIX 38374BJ87 September 2026 BE 51,400,000 PAC 2.50 FIX 38374BJ95 September 2026 BG 51,400,000 PAC 3.00 FIX 38374BK28 September 2026 BH 51,400,000 PAC 3.50 FIX 38374BK36 September 2026 BJ 51,400,000 PAC 4.00 FIX 38374BK44 September 2026 BK 51,400,000 PAC 4.50 FIX 38374BK51 September 2026 IB 30,840,000 NTL(PAC) 5.00 FIX/IO 38374BK69 September 2026 Combination 3(5) LC $  20,000,000 BL $  20,000,000 PAC 3.50% FIX 38374BL27 April 2028 BM 20,000,000 PAC 4.00 FIX 38374BL35 April 2028 BN 20,000,000 PAC 4.50 FIX 38374BL43 April 2028 IC 6,000,000 NTL(PAC) 5.00 FIX/IO 38374BL50 April 2028 Combination 4(5) KA $  25,200,000 BO $ 4,200,000 SUP 0.00% PO 38374BL68 November 2030 BT 24,000,000 SUP 5.25 FIX 38374BL76 November 2030 BU 22,909,090 SUP 5.50 FIX 38374BL84 November 2030 BX 21,913,043 SUP 5.75 FIX 38374BL92 November 2030 BY 21,000,000 SUP 6.00 FIX 38374BM26 November 2030 B-9