As a result of detection by the known code portion detecting unit, the decoder unit decodes the coded data received by the receive unit when there is no known code portion {HEAD ~ the decoder unit} decodes {TAIL ~ the coded data} that was replaced by the first substitution unit when there is the known code portion 
As a result of detection by the known code portion detecting unit , the decoder unit decodes the coded data received by the receive unit when there is no known code portion { HEAD ~ the decoder unit } decodes { TAIL ~ the coded data } that was replaced by the first substitution unit when there is the known code portion
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