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I checked the wiki and didn't find these:
U perms:
Ua: R U2 R2' U' R U R U2 R' U' R' U R (which can be done with only 1 regrip plus it's 2 gen )
Ub: R' U' R U R U2 R' U' R' U R2 U2 R'

I checked the wiki and didn't find these:
U perms:
Ua: R U2 R2' U' R U R U2 R' U' R' U R (which can be done with only 1 regrip plus it's 2 gen )
Ub: R' U' R U R U2 R' U' R' U R2 U2 R'

I checked the wiki and didn't find these:
U perms:
Ua: R U2 R2' U' R U R U2 R' U' R' U R (which can be done with only 1 regrip plus it's 2 gen )
Ub: R' U' R U R U2 R' U' R' U R2 U2 R'