1 for (int c0 = 0; c0 < ni; c0 += 1) 2 for (int c1 = 0; c1 < nj; c1 += 1) { 3 S_2(c0, c1); 4 for (int c2 = 0; c2 < nk; c2 += 1) 5 S_4(c0, c1, c2); 6 } 7