in diagonal, orient with Y2 to reverse between clock and counterclockwise

**opll_butterfly_-+**

L' U' L' U R U' L U R' L |
---|

back to menu

Memorization: (L' U' L' U) (R U' L) (U R' L)

on the same face, version clock and counterclockwise

**counterclockwise**

U' R2 D R' U2 R D' R' U2 R' |
---|

back to menu

**clockwise**

L F R' F' L' F R F' |
---|

back to menu

Memorization: U' R2 D R' U2 R D' R' U2 R': roughly pattern U R D R x 2, but difficult to find any shortcut or mnemonic hook

Memorization: L F R' F' L' F R F': L R' L' R interwoven with F F' F F'