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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
+```