static size_type serialize_maps(std::ostream& out, const map_type& map, const inv_map_type& inv_map, structure_tree_node* v=nullptr,
SDSL_UNUSED std::string name="") {
size_type written_bytes = 0;
written_bytes += map.serialize(out, v, "alphabet_map");
written_bytes += inv_map.serialize(out, v, "inverse_alphabet_map");
return written_bytes;
}
