PBL 4
#Algorithm
1R2 U R2 U' D' R2 D R2
2y' F2 U' F2 U2 R2 U' R2
3y2 R2 U' R2 U2 F2 U' R2
4y2 z U2 R U2' R2' F2 R U2
5R2 U R2 U2 y L2 U L2
6R2 U R2 U D R2 U R2
7R2 U' B2 U2 R2 U' R2
8R2 U R2 U2 y' R2 U R2
9y2 R2 U' R2' U2 y R2 U' R2'
10y2 L2 U L2' U D L2 U L2'
11y2 R2 U' R2' U' D' R2 U' R2
12R2 U R2 U2 B2 U R2