4x4 - Reduction Method - Phase 4
Parity issues
Sometimes some odd cases can appear. Edges might need twisted around.
Case 1
Only one pair of edges not oriented correctly.
(r2 B2 U2 l) (U2 r' U2 r) (U2 F2 r F2) (l' B2 r2)
Case 2
Two opposite edge pairs not oriented correctly.
Uw2 Lw2 U2 l2 U2 Lw2 Uw2
Case 3
Two adjacent edge pairs not oriented correctly.
L2 D Fw2 Lw2 F2 l2 F2 Lw2 Fw2 D' L2
Case 4
Two adjacent corners not oriented correctly.
Uw2 Lw2 U2 l2 U2 Lw2 Uw2 F' U' F U F R' F2 U F U F' U' F R
Case 5
Two opposite corners not oriented correctly.
Uw2 Lw2 U2 l2 U2 Lw2 Uw2 R U' L U2 R' U R L' U' L U2 R' U L' U