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Sets the given keys to their respective values.
`MSETNX` will not perform any operation at all even if just a single key already
exists.
Because of this semantic `MSETNX` can be used in order to set different keys
representing different fields of a unique logic object in a way that ensures
that either all the fields or none at all are set.
`MSETNX` is atomic, so all given keys are set at once.
It is not possible for clients to see that some of the keys were updated while
others are unchanged.
@return
@integer-reply, specifically:
* `1` if the all the keys were set.
* `0` if no key was set (at least one key already existed).
@examples
```cli
MSETNX key1 "Hello" key2 "there"
MSETNX key2 "new" key3 "world"
MGET key1 key2 key3
```
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