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Returns the members of the set resulting from the union of all the given sets.
For example:
```
key1 = {a,b,c,d}
key2 = {c}
key3 = {a,c,e}
SUNION key1 key2 key3 = {a,b,c,d,e}
```
Keys that do not exist are considered to be empty sets.
@return
@array-reply: list with members of the resulting set.
@examples
```cli
SADD key1 "a"
SADD key1 "b"
SADD key1 "c"
SADD key2 "c"
SADD key2 "d"
SADD key2 "e"
SUNION key1 key2
```
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