code: def sim_sift4(src, tar, max_offset=5, max_distance=0):
      
      return Sift4().sim(src, tar, max_offset, max_distance)
docs: Return the normalized "common" Sift4 similarity of two terms.
  
      This is a wrapper for :py:meth:`Sift4.sim`.
  
      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
      -------
      float
          The normalized Sift4 similarity
  
      Examples
      --------
      >>> round(sim_sift4('cat', 'hat'), 12)
      0.666666666667
      >>> sim_sift4('Niall', 'Neil')
      0.6
      >>> sim_sift4('Colin', 'Cuilen')
      0.5
      >>> sim_sift4('ATCG', 'TAGC')
      0.5