Hello,
If I got you correctly about the no-repeated combination, 1, 12, 2, 3 = 1-1-2-2-3 and also 1,12,23 = 1-1-2-2-3 and output will have 1-1-2-2-3 only once.
I think I can build you the macro which will spit out the combo's in Excel :)
Please let me know if you want to proceed.
Thanks!