Prevent circular close as exact duplicate loop
68739
Circular duplicate link allowed
43391
prevent user creating a duplicate node title
82191
What happened to the link to the duplicate when a question is closed as a duplicate?
10299
Circular duplicates in the close review queue?
78245
Closures in a for loop
108227
Why php iteration by reference returns a duplicate last record?
96966
Grant the OP a binding close as duplicate vote
24779
How SO handles close reason on equal number of Close votes different catagories
103923
Double orthogonal complement is equal to topological closure
15588
Introduce a  "general reference" close reason
35175
How to avoid multiple running instances of same handler function when running it from editor?
65018
How to prevent behavior-attached functions from being attached twice?
53264
Proper way to close an AutoCloseable
22555
How to assign same Data to multiple object copies
108212
Why are people so trigger happy with close as duplicate?
133887
Are questions closed as duplicates ever automatically deleted?
70074
How to handle a deliberate duplicate question