code: def is_palindrome_r(s):
      if len(s) <= 1:
          return True
      elif s[0] != s[-1]:
          return False
      else:
          return is_palindrome_r(s[1:-1])
  
label_desc: Use image node_id 3 for calling a global function with example usage: is_palindrome_r(s) and returns: True, False, is_palindrome_r