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The author of the above paper, which appeared in this Transactions, vol. IT-12, pp. 189-195, April 1966, has called the following to the attention of the Editor. The symbol d should have read d(c): in the first line after (3); in the right-hand side of (4); in the first and seventh lines of the last paragraph; and on the same page, and in (8) and (11). The following definition should be inserted after (4): 'The symbol d is the set of decoding rules d(c) for each c.' Finally, (34) is corrected.