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I think FMC scrambles should always be non-optimal. If they are optimal, it actually makes it more difficult to find a valid optimal solution - because it is likely to be related to (read: the inverse of) the scramble

L2 R D' B2 D2 R B R' U' R D B2 F2 D' B' F U R' L D U R' U L' B'

Cross: z' D' M B L x
1: U2 L2 B L U2 B' U L
2: F2 L2 U' L U L2 F U' F
3: L U L' R' F' U2 F R
4: B2 U' B D' B' U D B2 D' B' D
ELL: R U R' U' M' U R U' R' U' M U2 M' U' M

L2 R D' B2 D2 R B R' U' R D B2 F2 D' B' F U R' L D U R' U L' B'

Cross: z' D' M B L x
1: U2 L2 B L U2 B' U L
2: F2 L2 U' L U L2 F U' F
3: L U L' R' F' U2 F R
4: B2 U' B D' B' U D B2 D' B' D
ELL: R U R' U' M' U R U' R' U' M U2 M' U' M

L2 R D' B2 D2 R B R' U' R D B2 F2 D' B' F U R' L D U R' U L' B'

Cross: z' D' M B L x
1: U2 L2 B L U2 B' U L
2: F2 L2 U' L U L2 F U' F
3: L U L' R' F' U2 F R
4: B2 U' B D' B' U D B2 D' B' D
ELL: R U R' U' M' U R U' R' U' M U2 M' U' M