The direction of the center block is adjusted ① in the U plane, and the directions of the two center blocks in the F plane are adjusted simultaneously: (r u r) (u r u) (u r u).

② Adjustment direction of single center block: (r u' r u') (f u f')

T-block direction adjustment

③ The direction of the upper and lower (i.e. front and rear) trapezoidal blocks on the U-plane is adjusted at the same time: (M U M U M U2)(M' U M' U M').

④ The direction of the right and front two trapezoidal blocks on the U plane is adjusted at the same time: (R U R' U')×2.