Quest Detective Log #'s

So I noticed that the table i made had a weird pattern so I asked my guild about the number they received on their quest. Oddly enough, the pattern and number i got was (7, 9, 10, 4) and my guildie had (6, 8, 9, 3). So wild guess is that theres only 2 others and thats (5, 7, 8, 2) and (4, 6, 7, 1). I'm wondering if anyone else has gotten a different pattern of numbers or if my guess is correct and there are only 4 variations to this quest.

Today, I had 1, 3, 4, and 8.

I think the spacing between the books is always consistent, but there are definitely 10 quests.