User blog comment:Phuocphuc46/So I've been thinking a lot/@comment-25867024-20151015120334/@comment-26429063-20151017013310

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If there is a vandal that vandalize a page multiple times, all you have to do is check the edit by pressing the magnifier icon in the Wiki Activity and then just click "Rollback", the reverted edit will not be appear in the Wiki Activity, leading to many vandals believe that no one is editing it.