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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
+```