code: public Octahedral normalize() {
          int cfg = getConfigOrder();
          if (cfg == 1)
            return this;
          if (cfg < 1 || cfg > 30)
              throw new IllegalArgumentException(
                  "Invalid config order: " + cfg + ", octahedral should be"
                  + "1 <= order <= 30!");
          IAtom[] carriers = invapply(getCarriers().toArray(new IAtom[6]),
                                      PERMUTATIONS[cfg-1]);
          return new Octahedral(getFocus(), carriers, 1);
      }
docs: Normalize the configuration to the lowest order (1). For example
  <pre>C[Co@OH8](F)(Br)(Cl)(I)S</pre>
  is the same as
  <pre>C[Co@OH1](F)(Cl)(Br)(I)S</pre>. The normalised form is easy to
  work with as the first and last carriers form an axis, the middle four
  equatorial carriers are arranged anti-clockwise looking from the first carrier.
  @return the normalized form