bruno@Solo:~/Desktop/po$ python heuristic.py 6_10_origin.TXT
Traceback (most recent call last):
  File "heuristic.py", line 76, in <module>
    main(sys.argv)
  File "heuristic.py", line 70, in main
    instance.from_raw_string(text_instance)
  File "/home/bruno/Desktop/po/instance.py", line 15, in from_raw_string
    tokens = raw.replace("\r\n", "\n").replace("\n", " ").split(" ")
AttributeError: 'list' object has no attribute 'replace'