def METHOD_NAME():
    """
    Transducer for 20-99 e.g
    hai ba -> 23
    """
    graph_one = pynini.cross("mốt", "1")
    graph_four = pynini.cross("tư", "4")
    graph_five = pynini.cross("lăm", "5")
    graph_ten = pynini.cross("mươi", "")
    optional_ten = pynini.closure(delete_space + graph_ten, 0, 1)
    graph = pynini.union(
        ties_graph + optional_ten + delete_space + (graph_digit | graph_one | graph_four | graph_five),
        ties_graph + delete_space + graph_ten + pynutil.insert("0"),
    )
    return graph