code: def tuples(self, rlist):
          
  
          m, m1 = self.args
          for r in rlist:
              r, z = divmod(r, m1)
              r, k = divmod(r, 12)
              u, w = divmod(r, m)
              yield u, w, k, z
docs: Converts a sequence of linear_index node labels into
          pegasus_index node labels, preserving order
  
          Parameters
          ----------
          rlist : sequence of tuples
              The linear_index node labels
  
          Returns
          -------
          qlist : iterable of ints
              The pegasus_index node lables corresponding to rlist