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I think you don't need sorted, works just fine without it.
you cannot be sure about that. set returns unordered collection of unique elements from the iterable. we cannot be sure about the output of set() as it is unordered and need not be sorted.
sorted() is required to return a sorted list from the unordered set. maybe it worked for you but it cannot be guaranteed to work everytime.
the list() function is redundant as sorted() returns a list itself.