code: def is_vowel(str_ser, i):
      """Returns True if word[i] is a vowel, False otherwise
      see:  is_consonant for more description
      """
      return str_ser.str.is_vowel(i)
  
label_desc: Use image node_id 2 for calling a global function with example usage: is_vowel(str_ser, i) and returns: str_ser