{
  for (int c0 = 3; c0 <= 26; c0 += 3)
    S2(c0, c0 / 3);
  S1(27);
  S2(27, 9);
  for (int c0 = 30; c0 <= 100; c0 += 3)
    S2(c0, c0 / 3);
}