removeCommonList (f1:t1) (f2:t2)
  | f1 == f2  = removeCommonList t1 t2
  | otherwise = (f1:t1, f2:t2)
removeCommonList (f1:t1) (f2:t2)
  | f1 == f2  = removeCommonList t1 t2
  | otherwise = (f1:t1, f2:t2)
removeCommonList (f1:t1) (f2:t2)
  | f1 == f2  = removeCommonList t1 t2
  | otherwise = (f1:t1, f2:t2)