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    A message queue is a queue of messages sent between applications. It includes a sequence of work objects that are waiting to be processed.
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    Redis internally uses a hash table to store the elements as a Set.
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    The Redis database internally stores List as a linked list. This linked list has a `head` and `tail`
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    If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.