I have a list of lists and I want to remove all the duplicates so that the similar lists will not appear at all in the new list.

```
k = [[1, 2], [4], [5, 6, 2], [1, 2], [3], [4]]

output == [[5,6,2], [3]]

```

So for example, `[1,2]` have a duplicate so it should not appear in the final list at all. This is different from what others have asked as they wanted to keep one copy of the duplicate in the final list.