func_code: def intersection():
      import sys
      d1 = {}
      i = 0
      while i != len(f1con):
          line = f1con[i].rstrip()
          d1[line] = True
          i = i + 1
      dups = []
      i = 0
      while i != len(f2con):
          line = f2con[i].rstrip()
          if line in list(d1.keys()):
              dups.append(line)
          i = i + 1
      dups = sorted(list(set(dups)))
      return dups