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Find the Huffman codes of 3rd, and 4th extension of three sources below, and average length...

Find the Huffman codes of 3rd, and 4th extension of three sources below, and average length per single source alphabet.

A: Source symbols with probabilities 1/3, 1/3, 1/3
B: Source symbols with probabilities 1/2, 1/4, 1/4
C: Source symbols with probabilities 3/4, 1/8, 1/8

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