code: def tuples(self, rlist):
          
  
          m, n, t = self.args
          for r in rlist:
              r, k = divmod(r, t)
              r, u = divmod(r, 2)
              i, j = divmod(r, n)
              yield i, j, u, k
docs: Converts a sequence of linear_index node labels into
          chimera_index node labels, preserving order
  
          Parameters
          ----------
          rlist : sequence of tuples
              The linear_index node labels
  
          Returns
          -------
          qlist : iterable of ints
              The chimera_lindex node lables corresponding to rlist