code: def tuple(self, r):
          
  
          m, m1 = self.args
          r, z = divmod(r, m1)
          r, k = divmod(r, 12)
          u, w = divmod(r, m)
          return u, w, k, z
docs: Converts the linear_index `q` into an pegasus_index
  
          Parameters
          ----------
          r : int
              The linear_index node label
  
          Returns
          -------
          q : tuple
              The pegasus_index node label corresponding to r