code: def convert_superscript(written: str):
      """convert superscript to regular character"""
      written = re.sub("²", "2", written)
      written = re.sub("³", "3", written)
      return written
  
file_path: NeMo/nemo/collections/nlp/data/text_normalization/utils.py
imports: import string
  from copy import deepcopy
  import regex
  from tqdm import tqdm
  from nemo.collections.nlp.data.text_normalization import constants
label_desc: Use image node_id 3 for calling a global function with example usage: convert_superscript(written) and returns: written