Optimal H perm

z2 R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D R U R' U' D