text: for (int c0 = 2; c0 <= 4; c0 += 1)
    for (int c1 = 2; c1 <= 9; c1 += 1)
      s0(c0, c1);
  for (int c0 = 5; c0 <= 9; c0 += 1) {
    s1(c0, 1);
    for (int c1 = 2; c1 <= 9; c1 += 1) {
      s1(c0, c1);
      s0(c0, c1);
    }
  }
  