SMISMEMBER
Syntax
        SMISMEMBER key member [member ...]
- Available since:
 - 6.2.0
 - Time complexity:
 - O(N) where N is the number of elements being checked for membership
 - ACL categories:
 - 
              
                
@read,@set,@fast, 
Returns whether each member is a member of the set stored at key.
For every member, 1 is returned if the value is a member of the set, or 0 if the element is not a member of the set or if key does not exist.