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Removes and returns the last elements of the list stored at `key`.
By default, the command pops a single element from the end of the list.
When provided with the optional `count` argument, the reply will consist of up
to `count` elements, depending on the list's length.
@return
When called without the `count` argument:
@bulk-string-reply: the value of the last element, or `nil` when `key` does not exist.
When called with the `count` argument:
@array-reply: list of popped elements, or `nil` when `key` does not exist.
@examples
```cli
RPUSH mylist "one" "two" "three" "four" "five"
RPOP mylist
RPOP mylist 2
LRANGE mylist 0 -1
```
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