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This program is intended to group letters of an alphabet.

The following paper contains the description of the method:
Boris Ryabko, Jaakko Astola, Karen Egiazarian. Fast Codes for Large Alphabets.
Communications in Information and Systems, v.3, n. 2, pp.139-152. download text.


The upper bound for the additonal redundancy which is caused by grouping
Alphabet size Special version for members of IEEEE only
General case
The sizes of the subsets are powers of 2

javascript code by Danil B. Ryabko
algorithms by Boris Ya. Ryabko .