The source of a duplicated question is already removed, what to do with the duplicated question?
74028
"Duplicate of...[deleted post]"
4056
Can we clarify to the OP that their question is not yet closed and the duplicates are only suggestions?
47476
Is it possible to exclude questions I've already answered from the search criteria?
104491
Single question thread with multiple questions, some duplicates
45757
How can a question deleted by community be undeleted?
106883
Auto-flag duplicates of deleted questions for reopening / deletion
133887
Are questions closed as duplicates ever automatically deleted?
8310
'Possible duplicate' comment not appearing for questions with deleted comments containing the link
126330
Wrong wording of close message when question is closed as duplicate of more than one
138119
Duplicate question close reason says "already has an answer," which is often false
100366
What is best way to find duplicate questions?
64859
Is it acceptable to add a duplicate answer to several questions?
70613
“possible duplicate” comment should be re-added if it's been deleted
9251
Do you delete your own answer when it's a duplicate?
154856
Wording of "possible/exact duplicates" when closing the question
7406
When merging questions, leave the duplicate one as a placeholder
82853
Can Community ♦ raise a duplicate content flag when an answer is deleted and re-posted as a new answer?