code: def _split_ascii(self, s, charset, firstlen, splitchars):
      chunks = _split_ascii(
          s,
          firstlen,
          self._maxlinelen,
          self._continuation_ws,
          splitchars,
      )
      return zip(chunks, [charset] * len(chunks))
  
imports: import re
  import binascii
  import email.quoprimime
  import email.base64mime
  from email.errors import HeaderParseError
  from email.charset import Charset
label_desc: Use image node_id 8 for calling the Header obj's underlying member method code with example usage: obj._split_ascii(s, charset, firstlen, splitchars) and returns: zip