1 for (int c0 = 2; c0 <= 8; c0 += 2) 2 for (int c1 = 1; c1 <= 9; c1 += 1) { 3 if (c0 % 4 == 0) 4 s0(c1, c0); 5 s1(c1, c0); 6 } 7