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Description of the problem] use Huffman encoding of information and communication can greatly improve the channel utilization, reduce the information transmission time, lower transmission costs. However, this requires the sending end through a coding system for pre-treatment of mass data encoding, will be heard at the receiving end of the data decoding (recovery). For duplex channel (ie, two-way transmission of information can be channel), each client requires a full encoder/decoder system. Test for such information transceiver station to write a Huffman encoder/decoder system.