Eliminate Duplicates of a List (Python)

I have a list of lists and need to eliminate all lists that have the same 3rd element, and save 1.

For example:


could turn into:


I've attempted a solution that eliminates all lists that have the same 2nd index using lambda, but I don't know how to save one of each element like set() does--I just get:



Python sets should still work for you:

>>> seen = set()
>>> result = []
>>> for s in x:
    e = s[2]
    if e not in seen:

>>> result
[[1, 2, 3], [2, 4, 6], [8, 5, 9]]

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