ikegami,
You will have to forgive me, but I have no idea how this solves the problem I asked. It could very well be that I have not done a good job of explaining what I want but in your example: 
N = 26
K = 25
C = 65,780

[download]
I do not see how your output tells me that the combination representing 'ABCHI' which should be a single bit in a bitstring of 65,780 bits is present?

Cheers - L~R

In reply to Re^2: Algorithm to convert combinations to bitstring by Limbic~Region
in thread Algorithm to convert combinations to bitstring by Limbic~Region

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