4x4 - Reduction Method
Solve First Two Centers
Solve the center pieces for two opposite faces.
Only Case
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Solve Second Two Centers
Solve the center pieces for two other adjacent faces.
Only Case
-
Solve Last Two Centers
Solve the center pieces for the last two faces.
Case 1
d' F' d
Case 2
d' F2 d
Case 3
d' F' d F2 d' F' d