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<p>The design of binary block codes that are capable of correcting up to t symmetric errors and detecting all unidirectional errors is discussed. A class of systematic t-symmetric-error-correcting/all-unidirectional-error-detecting (t-SyEC/AUED) codes are proposed. When t=0 the proposed codes become Berger codes. For t=1, the proposed codes are shown to be of asymptotically optimal order. Methods to construct nonsystematic t-SyEC/AUED codes for t=2 and 3 are also presented.</p>
unidirectional error detecting codes; binary block codes; Berger codes; t-SyEC/AUED codes; error correction codes; error detection codes.

S. Reddy and S. Kundu, "On Symmetric Error Correcting and all Unidirectional Error Detecting Codes," in IEEE Transactions on Computers, vol. 39, no. , pp. 752-761, 1990.
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