new_contents: import sys
  import os
  import re
  
  l = []
  for lines in open(sys.argv[1], 'rU'):
          lexeme = lines.strip().split("_")
          tag = lexeme[4]
          print tag
  	if tag not in l:
  		l.append(tag)
  print l
  
  
subject: tag parser from file names