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Executes all previously queued commands in a [transaction][tt] and restores the
connection state to normal.
[tt]: /topics/transactions
When using `WATCH`, `EXEC` will execute commands only if the watched keys were
not modified, allowing for a [check-and-set mechanism][ttc].
[ttc]: /topics/transactions#cas
@return
@array-reply: each element being the reply to each of the commands in the atomic
transaction.
When using `WATCH`, `EXEC` can return a @nil-reply if the execution was aborted.
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