code: def tonos_oxia_converter(text, reverse=False):
      """For the Ancient Greek language. Converts characters accented with the
      tonos (meant for Modern Greek) into the oxia equivalent. Without this
      normalization, string comparisons will fail."""
      for char_tonos, char_oxia in TONOS_OXIA.items():
          if not reverse:
              text = text.replace(char_tonos, char_oxia)
          else:
              text = text.replace(char_oxia, char_tonos)
      return text
  
imports: from cltk.alphabet.text_normalization import cltk_normalize, remove_odd_punct, split_leading_punct, split_trailing_punct
label_desc: Use image node_id 3 for calling a global function with example usage: tonos_oxia_converter(text, reverse) and returns: text