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1. Multiple replace in one pass

   import re
   
   def strTr( text, dic ):
       """ Replaces keys of dic with values of dic in text.
           2005-02 by Emanuel Rumpf """
       pat = "(%s)" % "|".join( map(re.escape, dic.keys())  )
       return re.sub( pat, lambda m:dic[m.group()], text )