Give a "Not a duplicate button" on a question
13335
Someone flagged my question as already answered, but it's not
51087
Remove votes to close question X as a duplicate of Y if question Y is closed as a duplicate of X
100205
Make it possible to prevent voting on time-limited questions in meta without a historical lock
14173
Show original question during editing a question
44211
Duplicate notification for the same reputation event after editing question title
76205
It should be possible to retag a question without bumping it to the front page
48639
Why prevent duplicate questions?
19629
Where is it preferred to place the answer to duplicate questions?
112760
Bug when marking a question as duplicate
35162
Duplicate questions without answers
3685
Confirming that my own question is a duplicate by voting to close should have immediate effect
64859
Is it acceptable to add a duplicate answer to several questions?
138333
Do not allow giving minus one for new user questions
154856
Wording of "possible/exact duplicates" when closing the question
16323
How do I change a close vote to a duplicate?
12566
Give an incentive for finding duplicate questions
56691
Disallow closing of questions with a certain number of question / answer upvotes