for (int c0 = 2; c0 <= 9; c0 += 1) {

  if (c0 >= 5) {

    s1(c0, 1);

    for (int c1 = 2; c1 <= 9; c1 += 1) {

      s1(c0, c1);

      s0(c0, c1);

    }

  } else

    for (int c1 = 2; c1 <= 9; c1 += 1)

      s0(c0, c1);

}