code: def athalianatruth(args):
      
      p = OptionParser(athalianatruth.__doc__)
      opts, args = p.parse_args(args)
  
      if len(args) != 2:
          sys.exit(not p.print_help())
  
      atxt, bctxt = args
      g = Grouper()
      pairs = set()
      for txt in (atxt, bctxt):
          extract_groups(g, pairs, txt)
  
      fw = open("pairs", "w")
      for pair in sorted(pairs):
          print("\t".join(pair), file=fw)
      fw.close()
  
      fw = open("groups", "w")
      for group in list(g):
          print(",".join(group), file=fw)
      fw.close()
docs: %prog athalianatruth J_a.txt J_bc.txt
  
      Prepare pairs data for At alpha/beta/gamma.