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Well, I actually disagree that this contsruction strongly belongs to spoken language. You can find it in quite a serious article, for example, something like "мы никак не научимся жить по закону /...

Spoken language is a very extensive conception. Isn't spoken language used in written literature, for example?[/quote]

Of course it can be used in "written" literature - yet mostly as "spoken" by...

Used only in spoken language.