Apparently, in "The Structure of the Japanese Language" chapter 8 page 119,
Kuno asserts that the following is grammatical:

> John wa Tokyo ni ni wa itta ga, Osaka ni ni wa ikanakatta

I have a few questions. Firstly, what triggers this duplication? Secondly,
what difference would it make if we were to replace にには with には? Kuno does not
really go into too much detail with regards to this particle duplication
phenomenon; however, he provides quite a few examples of this phenomenon, but
nothing more than that. I have not seen or heard this type of construction
before, but I would appreciate any leads (perhaps a relevant paper) greatly.

Update: Kuno says that the presence of は triggers the duplication (?)
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question
particles syntax
"...there is a very peculiar phenomenon of particle duplications in Japanese" (Kuno 1973)
> > John wa Tokyo ni ni wa itta ga, Osaka ni ni wa ikanakatta
>
> =Firstly, what triggers this duplication? Secondly, what difference would it
> make if we were to replace にには with には?
>
> Update: Kuno says that the presence of は triggers the duplication (?)

These constructions make sense to us and are used to especially emphasise the
part right before it. I can't tell if there is a pattern, but we use this type
of construction when we feel the need for it. I think that we like to avoid
this in formal writing though.

～にには行ったけど、～あなたののはあるけど.  
It's even possible without は: あなたのことをを話してるのよ, 東京にに行ったんだよ.
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answer