D2 L D B2 D2 U F2 D' B2 F2 U' B2 L D B R' B F2 R2
inspection: z2 y'
cross: D F L R2
first pair: U' R U2 R' U y' R' U' R
second pair: y' U R' F R F' R' U' R
third pair: y' U' R' F R F' R U' R'
fourth pair: y U R U R' U2 R U' R
oll: r U R' U' r' R U R U' R'
pll: r' D' F r U' r' F' D r2 U r' U' r' F r F' (nb perm)