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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
General case
The sizes of the subsets are powers of 2