code: def saved_xids(self):
          
          if self._saved_xids is None:
              self._saved_xids = []
              if self.debug:
                  fpfn = os.path.join(self.tcex.args.tc_temp_path, 'xids-saved')
                  if os.path.isfile(fpfn) and os.access(fpfn, os.R_OK):
                      with open(fpfn) as fh:
                          self._saved_xids = fh.read().splitlines()
          return self._saved_xids
docs: Return previously saved xids.