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primary_list = tuple([line.strip() for line in open('file1.txt', 'r')])
secondary_list = tuple([line.strip() for line in open('file2.txt', 'r')])
f = open('test.txt', 'w')
users_unique = []
def isUnique(value):
  if value not in users_unique:
    users_unique.append(value)
    return True
  else:
    return False
def common():
  for item in primary_list:
    if item is None:
      continue
    elif item in secondary_list and isUnique(item):
      f.write(str(item)+'\r\n')
  print 'Complete'
                                
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