code: def print_paired_paths(nb_file, fmt):
      
      notebook = readf(nb_file, fmt)
      formats = notebook.metadata.get('jupytext', {}).get('formats')
      if formats:
          for path, _ in paired_paths(nb_file, fmt, formats):
              if path != nb_file:
                  sys.stdout.write(path + '\n')
docs: Display the paired paths for this notebook