The daiin

[Scarecrow]

f89r2 has daiin thrice in a row.

I just red few articles from a great Finnish philosopher, and found two sentences that come close to this. Maybe it can give food for thoughts.
"Ajattelun ajattelun ajattelu" and "ajatuksen ajatuksen ajatus"

Those two are prefect and regular, albeit funny, Finnish language sentences.
Meaning freely translated something like "thinking thinking of thinking" and "thought of thought of a thought".
It is possible same pattern to generate many other three or possibly even four word constructs.

Just for the interest.

Could you explain the grammar, morphology, and syntax of these sentences in more detail, please? I have studied some Finnish as well as Uralic linguistics, so I think (the thought of thinking) that I will be able to follow your explanations.

Well, I can try to give you some details but please bear with me, me and the Finnish grammar are very very far friends,and I sincerely do not remember that much of it. But let's give it a try. Always happy to help anyone who studies Finnish and Uralic languages".
My common man explanation is this:

Root noun is "Ajatus" -> "a thought"
Accusative of "Ajatus" is "Ajatuksen", and also "ajatus"
Genetive of "Ajatus" is also "Ajatuksen"

"Ajatuksen"(Acc) "Ajatuksen" (Gen) "Ajatus" (Acc)

Noun is "Ajattelu"
Genetive is "Ajattelun"
Accusative is "Ajattelun" and "Ajattelu"

"Ajattelun (acc) ajattelun (gen) ajattelu (acc)"

So it is practically kind of a game of genetive + accusative I guess.

A more common way to say that would be "Ajattelen miten ajattelua ajatellaan", but I would not have the same "feeling"

Finnish is well known for its alliteration, most famously in the Kalevala (e.g., "aivoni ajattelevi"), but even in the predilection of Finnish parents for naming their children alliteratively: One family tree in a Finnish textbook includes such sets of siblings as Aada, Atte, Aaro; Ella, Eetu, Elina; Liisa, Lassi; and Jaakko, Jorma. (It even extends this pattern to a couple married couples, Hannu & Helena and Jorma & Janita, but I hope this is not an actual factor in Finnish mate selection!)

Alliteration is very common indeed, and it is all about style and simplicity, to make it easier to remember. That's why they use alliteration also in marketing.
I believe alliteration is not an actual factor for coupling, but for baby names it is, as it is still quite common to give baby a name that starts with the same letters as the family name: Tiina Tikkanen, Hannu Hanhi, Lauri Laukkanen.