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SDIFF key1 key2 ... keyN

TIME COMPLEXITY: O(N) with N being the total number of elements of all the sets

DESCRIPTION: Return the members of a set resulting from the difference between the first set provided and all the successive sets. Example:

key1 = x,a,b,c
key2 = c
key3 = a,d
SDIFF key1,key2,key3 => x,b

Non existing keys are considered like empty sets.

RETURN VALUE: Multi bulk reply, specifically the list of common elements.

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