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Removes the specified members from the sorted set stored at `key`. Non existing
members are ignored.
An error is returned when `key` exists and does not hold a sorted set.
@return
@integer-reply, specifically:
- The number of members removed from the sorted set, not including non existing
members.
@history
- `>= 2.4`: Accepts multiple elements. In Redis versions older than 2.4 it was
possible to remove a single member per call.
@examples
```cli
ZADD myzset 1 "one"
ZADD myzset 2 "two"
ZADD myzset 3 "three"
ZREM myzset "two"
ZRANGE myzset 0 -1 WITHSCORES
```
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