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Returns the rank of `member` in the sorted set stored at `key`, with the scores
ordered from low to high.
The rank (or index) is 0-based, which means that the member with the lowest
score has rank `0`.
Use `ZREVRANK` to get the rank of an element with the scores ordered from high
to low.
@return
* If `member` exists in the sorted set, @integer-reply: the rank of `member`.
* If `member` does not exist in the sorted set or `key` does not exist,
@bulk-string-reply: `nil`.
@examples
```cli
ZADD myzset 1 "one"
ZADD myzset 2 "two"
ZADD myzset 3 "three"
ZRANK myzset "three"
ZRANK myzset "four"
```
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