[Python] Collection of strings as python dict key [duplicate]

I would like to use some strings

"A", "B", ...

as a single key for a python dict, but I don't care the order of those string: "A", "B", "C", should be considered the same as "B", "A", "C".

I tryed set(["A", "B", "C"]) but this is un-hashable.

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