SMEMBERS
Returns all the members of the set stored at key.
Syntax
SMEMBERS key
Details
- Available since: 1.0.0
 - Time complexity: O(N), where N is the set cardinality.
 - ACL categories: 
@read,@set,@slow 
Example
Assume we have a set called myset with members "member1", "member2", and "member3":
SADD myset "member1" "member2" "member3"
Now, let's retrieve all members from myset:
SMEMBERS myset
This will output:
1) "member1"
2) "member2"
3) "member3"
RESP2/RESP3 Reply
Array reply: list of members in the set.