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Returns the length of the list stored at `key`. If `key` does not exist, it is
interpreted as an empty list and `0` is returned. An error is returned when the
value stored at `key` is not a list.
@return
@integer-reply: the length of the list at `key`.
@examples
```cli
LPUSH mylist "World"
LPUSH mylist "Hello"
LLEN mylist
```
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