code: def getChirality(self, order):
          
          indices = tuple([self._initialOrder.index(atom.handle)
                           for atom in order])
          same = chiral_table[indices]
          if same:
              return self.chirality
          else:
              if self.chirality == "@": return "@@"
              else: return "@"
docs: (order)->what is the chirality of a given order of
          atoms?