(U2 D2 F D' F') //5+6c3-2s 
R' L'(R2 U R L') //11+4b2 6E
U2 R2 B R2 F  //HTR 16
D2 B2 D2 B2 R2 B2  //Fin  22

...B2 R2 B2 R' L U'...=R' L U2 R2 U  -1/21

学习一下

D2 F L U
B D2 R' F2 U2 L'  //10+2C3 4E
Bw L2 Fw R2 F
U2 B2 D2 R2 F2 R2 F2  //S+0  22


sooooo many vars，feels like that I'm missing a 20

(B' L F' D')
(L2 @ F U2 R2 B2 L) //10+4b2
(B' D2 F' D2 #)  //HTR & L8E  14

@=B2 * F2 z2  //8E→6E4X
#=R2 L2 x2  //6E4X→4E4X
*=U2 D2 y2   //sloved  +5/19 lol

edit：It can be found easily by DR if you switch after EO but it's 4c4e 0 pair

D' L' F' U
R2 F'([F2 R2 D2 L2 F'])  //11+4b2
R2 B2 L U2 R U2  //S  17


[]=B2 L2 F B' R2 D2 B'  +2

L' U' B'(F',U' L)  //rzp88 6p
U' F2 D' R' L'   //11+2c3 4E
D' L2 B2 D L2 D    //HTR  17
F2 D2 R2 B2      //Fin 21

U' R'(D' L, F) //rzp 88, 5p
B' U F' D' B   //10+2c3 4E
(R2 U')U R2 U  //HTR 15
B2 D2 B2 D2 R2 B2 R2  //Fin  22

B' D' U2 F
L2 U2 L2 U' R' U  //10+3
F2 R2 U2 Lw D2 Lw' D2 L  //HTR Ext
F2 U2 B2 U2  //M+0

R(F2 B R')
(L2 B D F') 8+4b2 4e
F2 L2 U L2 D'
B2 U2 D2 L2 B2  //random 3e and S-4x  18

noticed that F wont change anything and D' will fix 3E to S slice
so：
R F2 L2 U L2 D' B2 U2 D2 L2 B2 z2 F D'
(F2 B R' [L2 B])  //S slice
[]=F B' U2 F z2  +2/20