code: def contains_vowel(stem_ser):
      """
      Returns True if stem contains a vowel, else False
      """
      len_ser = stem_ser.str.len()
      max_len = len_ser.max()
      contains_vowel_flag = None
  
      for i in range(0, max_len):
          if contains_vowel_flag is None:
              contains_vowel_flag = is_vowel(stem_ser, i)
          else:
              contains_vowel_flag = contains_vowel_flag | is_vowel(
                  stem_ser, i
              )
  
      return contains_vowel_flag
  
label_desc: Use image node_id 3 for calling a global function with example usage: contains_vowel(stem_ser) and returns: contains_vowel_flag