{
  for (int c0 = 0; c0 <= M; c0 += 1)
    S1(c0);
  for (int c0 = 1; c0 <= M; c0 += 1)
    S2(c0);
  for (int c0 = 0; c0 <= M; c0 += 1)
    S3(c0);
}