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Remove the specified members from the set stored at `key`.
Specified members that are not a member of this set are ignored.
If `key` does not exist, it is treated as an empty set and this command returns
`0`.
An error is returned when the value stored at `key` is not a set.
@return
@integer-reply: the number of members that were removed from the set, not
including non existing members.
@examples
```cli
SADD myset "one"
SADD myset "two"
SADD myset "three"
SREM myset "one"
SREM myset "four"
SMEMBERS myset
```
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