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When all the elements in a sorted set are inserted with the same score, in order
to force lexicographical ordering, this command returns the number of elements
in the sorted set at `key` with a value between `min` and `max`.
The `min` and `max` arguments have the same meaning as described for
`ZRANGEBYLEX`.
Note: the command has a complexity of just O(log(N)) because it uses elements
ranks (see `ZRANK`) to get an idea of the range. Because of this there is no
need to do a work proportional to the size of the range.
@return
@integer-reply: the number of elements in the specified score range.
@examples
```cli
ZADD myzset 0 a 0 b 0 c 0 d 0 e
ZADD myzset 0 f 0 g
ZLEXCOUNT myzset - +
ZLEXCOUNT myzset [b [f
```
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