Merge/delete duplicates

[Helena]

Mysteriet på kyrkogården
Docksamlarens hus
Den hemliga operationen

These three titles have 2-3 editions each, but they're duplicates and I haven't been able to sort it out. (I was able to delete one with ISBN, but then I couldn't add the same ISBN to the remaining edition... and I wasn't able to delete the one without ISBN due to "many reviews"...)

Could a superlibrarian please make sure there's only one of each of these? Keep whichever version is better to keep and I'll make sure the info is complete when I know which one to edit. Thanks a bunch in advance!

[David]

#1-2 Done
#3 needs stuff to move ISBN, I already sent them a request.

Please don't delete editions with ISBN, this is against policy.

[David]

#3 done by support

[Helena]

Thank you so much!