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?