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Add the specified members to the set stored at `key`.
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Specified members that are already a member of this set are ignored.
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If `key` does not exist, a new set is created before adding the specified
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members.
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An error is returned when the value stored at `key` is not a set.
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@return
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@integer-reply: the number of elements that were added to the set, not including
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all the elements already present in the set.
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@examples
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```cli
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SADD myset "Hello"
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SADD myset "World"
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SADD myset "World"
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SMEMBERS myset
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```
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