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Inserts `element` in the list stored at `key` either before or after the
reference value `pivot`.
When `key` does not exist, it is considered an empty list and no operation is
performed.
An error is returned when `key` exists but does not hold a list value.
@return
@integer-reply: the length of the list after the insert operation, or `-1` when
the value `pivot` was not found.
@examples
```cli
RPUSH mylist "Hello"
RPUSH mylist "World"
LINSERT mylist BEFORE "World" "There"
LRANGE mylist 0 -1
```
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