  bool bcells = true;
  map_type cell_map =
    map_reduce(graph_traversal_cell_wf(), reduce_map_wf(), mesh_vw);
  bcells = bcells && (cell_map.size() == mesh_vw.size());
  ct = 0;

  for (map_it = cell_map.begin(); map_it != cell_map.end(); ++map_it)
  {
    if ((map_it->first != ct) || (map_it->second != 1))