document.write('
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  1. def chk(tab):
  2.       total_data=0
  3.       for i in range(0, len(tab), 4):
  4.             data=unpack(“>I”,tab[i:i+4])[0]
  5.             total_data += data
  6.       final_data=0xFFFFFFFF & total_data
  7.       return final_data
');