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Add the specified members to the set stored at `key`. Specified members that are
already a member of this set are ignored. If `key` does not exist, a new set is
created before adding the specified members.
An error is returned when the value stored at `key` is not a set.
@return
@integer-reply: the number of elements that were added to the set, not including
all the elements already present into the set.
@history
- `>= 2.4`: Accepts multiple `member` arguments. Redis versions before 2.4 are
only able to add a single member per call.
@examples
```cli
SADD myset "Hello"
SADD myset "World"
SADD myset "World"
SMEMBERS myset
```
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