code: def decode_rfc2231(s):
      """Decode string according to RFC 2231"""
      parts = s.split(TICK, 2)
      if len(parts) <= 2:
          return None, None, s
      return parts
  
imports: import os
  import re
  import time
  import datetime
  import urllib.parse
  from email._parseaddr import quote
  from email._parseaddr import AddressList
  from email._parseaddr import mktime_tz
  from email._parseaddr import parsedate, parsedate_tz, _parsedate_tz
label_desc: Use image node_id 17 for calling a global function with example usage: decode_rfc2231(s) and returns: parts, None,  None,  s