{

  for (int c0 = 1; c0 <= n; c0 += 1) {

    S1(c0, c0);

    for (int c1 = c0; c1 <= n; c1 += 1)

      S2(c0, c1);

    S3(c0, n);

  }

  for (int c0 = n + 1; c0 <= m; c0 += 1)

    S3(c0, n);

}