4x4 - Reduction Method - Phase 2
Pair up an edge.
Pair up one set of edge pieces.
Case 1
Pair up edges in same layer.
d R F' U R' F d'
Case 2
Pair up edges in different layer.
u'
Store the edge.
Move the pair into the up or down layer. Then repeat pairing and storing for first eight edges.
Only Case
Store pair in up layer.
R U' R'
Solve Last Four Edges
Pair up the last edge pieces using some algorithms.
Case 1
Pair up edge in same layer.
d R F' U R' F d'
Case 2
Pair up edge in different layer.
(R F' U R' F) (d R F' U R' F d')