Remove votes to close question X as a duplicate of Y if question Y is closed as a duplicate of X
52526
Circular duplicates strike again
39672
Allow voting "Vote to not close" from the question without being in a review
137966
Don't allow questions with close votes to be bountied
146576
Askers should be able to close their own question as a duplicate
16323
How do I change a close vote to a duplicate?
37750
Display "Closed as ..." before the actual question
126330
Wrong wording of close message when question is closed as duplicate of more than one
10293
How should duplicate questions be handled?
12566
Give an incentive for finding duplicate questions
119857
Could we allow child Meta questions to be closed as duplicates of Meta.SE ones?
111647
How to find questions closed as duplicates via the Data Explorer
114583
Should users be allowed to remove the "Possible Duplicate" links on closed questions?
106883
Auto-flag duplicates of deleted questions for reopening / deletion
70074
How to handle a deliberate duplicate question
24779
How SO handles close reason on equal number of Close votes different catagories
112391
How should one respond to "duplicate answer" flags?
69897
Integrate close and delete votes into /review