Each level alternates between numbers and alpha characters.  After 26 letters 
at an alpha level, you get aa, then ab, then ac, etc.

-- Bob

> On Nov 12, 2020, at 3:50 AM, Jean Louis <[email protected]> wrote:
> 
> Hello again,
> 
> What is the algorithm for Koutliner's numbering named `alpha`?
> 
> Is there any description or reference to that algorithm?
> 
> Jean

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