Voting to close as duplicate asks for question id or URL
10542
Show post(s) already chosen as duplicate suggestions in iOS app
131901
Make closing question users post a conscious explanation
86240
Please add the ability to filter [Closed] questions out of my results
51087
Remove votes to close question X as a duplicate of Y if question Y is closed as a duplicate of X
96966
Grant the OP a binding close as duplicate vote
126378
Do I leave a revised question closed even though it falls out of scope for a different reason than the original closure reason?
78861
Why are there two separate boxes about duplicate questions?
81134
What decides what to prepend the duplicate question list with on a duplicate question?
18509
Does the new guidance on duplicate questions suggest closing a question as duplicate, if the original answers the OP's question?
106952
"Please ask a new question" encourages question repetition for duplicates
64472
Manual "Possible duplicate of" comments are wrongly removed when question is closed
28716
Is it OK to ask a duplicate question on purpose?
102311
How does the system determine which one close reason should be displayed on a closed question, given the close votes?
117258
Is it ok to to delete and repost a duplicate question?
106883
Auto-flag duplicates of deleted questions for reopening / deletion
77534
Best practice for marking own questions that could belong on another/multiple sites
48639
Why prevent duplicate questions?