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Hi!
its an optimal coding technique in which the average codeword length approaches the uncertainity within one symbol but its better than the shannon's coding. Here, the two least probable symbols are combined into one super symbol(in case of binary coding), such that the probability of the super symbol is the sum of the probs of the combined symbols..The procedure would continue until we are left with two symbols in the end.. for more details Elements of information theory by "Thomas Cover" Chapter no. 5.
Regards,
Wajahat
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