What’s the better Z-perm?

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If the UF and UR edges need to be swapped before AUF, I do: M2' U M2' U M' U2 M2' U M'
Otherwise, if the UF and UL edges need to be swapped before AUF, I do: R' U' R U' R U R U' R' U R U R2 U' R'
 
M2 U M2 U M' U2 M2 U2 M'
or
M2 U' M2 U' M' U2 M2 U2 M'

Depends on if there's a UF UR or UF UL swap.
 
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