add books to dungeon builder harem series and consolidate duplicate entries

[Frederick]

This is the series page:
https://www.goodreads.com/series/3578...

books 1-4 are present
here is book 5
https://www.goodreads.com/book/show/1...

here is book 6 (duplicates need to consolidated)
https://www.goodreads.com/book/show/1...
this is a duplicate
https://www.goodreads.com/book/show/1...

here is book 7 (duplicates need to consolidated)
https://www.goodreads.com/book/show/2...
This is a duplicate
https://www.goodreads.com/book/show/2...

[Liralen]

Done.