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Redis is an advanced key-value store.  It is similar to memcached but
the dataset is not volatile, and values can be strings, exactly like in
memcached, but also lists, sets, and ordered sets.  These data types can
be manipulated with atomic operations to push/pop elements, add/remove
elements, perform server side union, intersection, difference between
sets, and so forth.  Redis supports different kinds of sorting
abilities.