code: def is_mandarin(c):
      """check character is Mandarin"""
      return (
          not is_english(c)
          and not c.isdigit()
          and c != " "
          and c != "<"
          and c != ">"
          and c != "'"
      )
  
imports: import argparse
  import collections
  import itertools
  import os
  import random
  import re
  import sys
label_desc: Use image node_id 4 for calling a global function with example usage: is_mandarin(c) and returns: unknown