Is it OK to retrospectively close as a duplicate?
57056
Opinions on closing an older question as a duplicate of a newer question
119893
How to reference a work that I refer to on multiple occasions?
9079
Mark-as-duplicate vs. Merge
16323
How do I change a close vote to a duplicate?
61416
Should I vote to close old questions?
13649
What to do with cross-site duplicates?
64472
Manual "Possible duplicate of" comments are wrongly removed when question is closed
151233
Why are duplicates not being merged?
46533
Duplicates of duplicates should be remapped
113626
"Close as duplicate" - what if only the answer is a duplicate?
107358
Duplicated content - how to tell Google I am original author
154568
Optimal way to ignore duplicate inserts?
9026
"Possible duplicate" notice not removed after reopening question
3426
What is a "closed" or "duplicate" question?
89812
Prevent circular close as exact duplicate loop
3685
Confirming that my own question is a duplicate by voting to close should have immediate effect
87002
Better duplicate closing on the iOS app