code: def is_duplicate(cls, dataset, data):
      for d in dataset:
          if d == data:
              return True
      return False
  
file_path: nlpaug/nlpaug/augmenter/char/char_augmenter.py
imports: import string
  import re
  from nlpaug.util import Method
  from nlpaug.util.text.tokenizer import Tokenizer
  from nlpaug import Augmenter
  from nlpaug.util import WarningException, WarningName, WarningCode, WarningMessage
label_desc: Use image node_id 4 for calling the CharAugmenter obj's underlying member method code with example usage: obj.is_duplicate(cls, dataset, data) and returns: False, True