[campos20]

2. R' U' F L2 B2 D2 F D2 R2 B2 L2 B D' L2 U R F D2 L' B R2 B F2 R' U' F

26

(R2 U) // EO
(L' F') L2 // 222
R B R2 ® // 223
(B' D2 R' B' R B') // AB5C (15)

L2 R # B R2 $ B R' B R D2 B R' F L U' R2

# L2 F' R2 F L2 F' R2 F (+6)
$ R2 F L F' R2 F L' F' (+5)

Solution
R F' R2 F L2 F' R2 F2 B L F' R2 F L' F' B R' B R D2 B R' F L U' R2

I found insertions cancelling 2 in several option. I did not have time to check for nested. When I wrote down, I realized one of them cancelled 3 by accident.