What ADDER code would result in a one slice implementation (1LUT + 2 flip flop) per bit

I firstly apologise to all that are beeing asked this question for the time and effort I would cause
To utilise the FPGA to a have a max number of adders I would need an adder synthesised in a way that balances the LUT and Flip Flop usage.
any suggestions?

Hi
Thanks for the amazing answer its really great to know that there is one adder per LUT I never really realised it
 the LUT is purely a Logic unit:
00 010101010101010
01 0011001100110011
10 0000111100001111
11 0000000011111111
so for the ADDER it needs per bit 2 EXOR 2 AND and 1 OR gate  that you can implement in one single LUT, 
the requirement is to calculate in parallel "flatten" the sequential bottle neck but you need the accumulator flip flops also nearby so with what you told one could have in a 2 LUT and 2 FF slice a 2 bit ADDER and ACC of 2 bits, hence  for 10'000 slices in theory a 20'000 bit adder. 
That is all I wanted to know and I opened this question so many can read and check is nothing wrong is said
Thanks to all that read and any suggestions are welcome!
 

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