2 set corners

2 unset corners, one clockwise and one counterclockwise, which is C1 and C3 or C4 depending on the pattern (C1 is always unset, C2 is always set). When the pattern is symmetric, there is only one instance because the role clockwise can be obtained from counterclockwise with an Y2 rotation. This is C1 that defines the spin.

Butterfly: 4 edges (symmetric)

2 wings with general diagonal direction.

C1 counterclockwise

R' F' L' F R F' L F

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