Flat tuples

Hi, are there any examples of 'flat tuple' implementation instead of 'recursive tuples'? I am looking all over the internet, and I am not able to find them. If anyone has an example, please post them here. Any example will suffice.
If you can, also explain how it works. Thanks!
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Do you count http://www.cplusplus.com/reference/tuple/tuple/ as recursive or flat?
May be a silly question, but whats the difference between flat and recursive tuple?
I do understand tuple recursion with variadic templates as I have studied how it's being implemented since I can find it easily over the internet. I am just not so sure about 'flat tuple' as my lecturer has casually mentioned about it today without going through what it is. And I just can't find a single example in the internet, maybe I missed it, not sure. And so my curious mind is seeking that out and I wanna know how it's actually being implemented.
Hm... this is interesting and maybe what your looking for...?

https://stackoverflow.com/questions/21180346/variadic-template-unpacking-arguments-to-typename
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