SECURITY GROUP 2 A percentage of the Group 2 Principal Distribution Amount will be applied to the Trustee Fee, and the remainder of the Group 2 Principal Distribution Amount (the "Group 2 Adjusted Principal Distribution Amount") and, beginning in Step 2, the ZB Accrual Amount will be allocated in the following order of priority: 1.  To the PAC I Classes, until reduced to their Aggregate Scheduled Principal Balance for that Distribution Date, in the following order of priority: a.  Sequentially, to LA, LB, LC, LD and LE, in that order, until retired b.  Concurrently, 50% to EL and 50% to LH, until LH is retired c.  To EL, until retired 2.  To JX, until reduced to its Scheduled Principal Balance for that Distribution Date 3.  95% to ZB, until retired 4.  Concurrently, until AB is retired: a.  8.8684228980% to AB b.  91.1315771020% as follows: i.  To AH, until retired ii.  Concurrently: (a)  91.6666666667% to AK (b)  8.3333333333% to ED2 5.  Concurrently: a.  12.1455530824% to AC, until retired b.  87.8544469176%, concurrently, as follows: i.  91.6666666667%, sequentially, to AK, AL and AM, in that order, until retired ii.  8.3333333333% to ED2, until retired 6.  Concurrently: a.  8.3333321342% to ED1, until retired b.  91.6666678658%, sequentially, to AD, AE and AG, in that order, until retired 7.  To JX, without regard to its Aggregate Scheduled Principal Balances, until retired 8.  To the PAC I Classes, in the same manner and order of priority described in Step 1 above, but without regard to their Aggregate Scheduled Principal Balances, until retired SECURITY GROUP 3 90.9090909091%  of  the  Group  3  Principal  Distribution  Amount  attributable  to  Ginnie Mae 2004-021 Class YD will be allocated to YD, until retired, and the remainder of the Group 3 Principal Distribution Amount will be allocated to EB, until retired S-7