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 1 Combination 1 DA $  28,840,000 CA $123,618,000 PAC I 5.500% FIX 38373Q4A6 September 2029 DB 51,967,000 DC 42,811,000 Combination 2(7) CA(5) $123,618,000 CB $123,618,000 PAC I 3.500% FIX 38373Q4B4 September 2029 CD 123,618,000 PAC I 4.000 FIX 38373Q4C2 September 2029 CE 123,618,000 PAC I 4.500 FIX 38373Q4D0 September 2029 CG 123,618,000 PAC I 5.000 FIX 38373Q4E8 September 2029 IC 44,952,000 NTL(PAC I) 5.500 FIX/IO 38373Q4F5 September 2029 Combination 3(7) DA $  28,840,000 DJ $  28,840,000 PAC I 3.500% FIX 38373Q4G3 April 2023 DK 28,840,000 PAC I 4.000 FIX 38373Q4H1 April 2023 DL 28,840,000 PAC I 4.500 FIX 38373Q4J7 April 2023 DM 28,840,000 PAC I 5.000 FIX 38373Q4K4 April 2023 IA 10,487,272 NTL(PAC I) 5.500 FIX/IO 38373Q4L2 April 2023 Combination 4(7) DB $  51,967,000 DN $  51,967,000 PAC I 3.500% FIX 38373Q4M0 February 2027 DP 51,967,000 PAC I 4.000 FIX 38373Q4N8 February 2027 DT 51,967,000 PAC I 4.500 FIX 38373Q4P3 February 2027 DU 51,967,000 PAC I 5.000 FIX 38373Q4Q1 February 2027 IB 18,897,090 NTL(PAC I) 5.500 FIX/IO 38373Q4R9 February 2027 Combination 5(7) DC $  42,811,000 DV $  42,811,000 PAC I 3.500% FIX 38373Q4S7 September 2029 DW 42,811,000 PAC I 4.000 FIX 38373Q4T5 September 2029 DX 42,811,000 PAC I 4.500 FIX 38373Q4U2 September 2029 DY 42,811,000 PAC I 5.000 FIX 38373Q4V0 September 2029 ID 15,567,636 NTL(PAC I) 5.500 FIX/IO 38373Q4W8 September 2029 B-95