code: def get_ipa_character_set(locale):
      if locale not in IPA_CHARACTER_SETS:
          raise ValueError(
              f"IPA character set not found for locale '{locale}'. "
              f"Supported locales {IPA_CHARACTER_SETS.keys()}"
          )
      char_set = set(IPA_CHARACTER_SETS[locale])
      return char_set
  
label_desc: Use image node_id 3 for calling a global function with example usage: get_ipa_character_set(locale) and returns: char_set