Redis set operations

Redis Sets are unordered collections of strings. Sets don't allow duplicate values.
Redis provides number of commands to work with redis sets.

Add elements to the set
Returns the number of elements in a set
Get all members of a set
Check member existence 
Get random element from set
Remove and return one member from set
difference between sets
difference between sets and store result
Get intersection all sets
Get intersection all sets and store result
Remove the member from source, and add the member to the destination
Removes the members from given set
Returns the union of all sets

Stores union of all sets to destination

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