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Returns the sorted set cardinality (number of elements) of the sorted set stored
at `key`.
@return
@integer-reply: the cardinality (number of elements) of the sorted set, or `0`
if `key` does not exist.
@examples
```cli
ZADD myzset 1 "one"
ZADD myzset 2 "two"
ZCARD myzset
```
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