code: def sift4_common(src, tar, max_offset=5, max_distance=0):
      
      return Sift4().dist_abs(src, tar, max_offset, max_distance)
docs: Return the "common" Sift4 distance between two terms.
  
      This is a wrapper for :py:meth:`Sift4.dist_abs`.
  
      Parameters
      ----------
      src : str
          Source string for comparison
      tar : str
          Target string for comparison
      max_offset : int
          The number of characters to search for matching letters
      max_distance : int
          The distance at which to stop and exit
  
      Returns
      -------
      int
          The Sift4 distance according to the common formula
  
      Examples
      --------
      >>> sift4_common('cat', 'hat')
      1
      >>> sift4_common('Niall', 'Neil')
      2
      >>> sift4_common('Colin', 'Cuilen')
      3
      >>> sift4_common('ATCG', 'TAGC')
      2