SUNIONSTORE

    1. dragonfly> SADD key1 "a"
    2. (integer) 1
    3. dragonfly> SADD key1 "b"
    4. (integer) 1
    6. dragonfly> SADD key2 "c"
    7. (integer) 1
    8. dragonfly> SADD key2 "d"
    9. (integer) 1
    10. dragonfly> SADD key2 "e"
    12. dragonfly> SUNIONSTORE key key1 key2
    13. (integer) 5
    14. 1) "a"
    15. 2) "c"
    16. 3) "b"
    18. 5) "e"