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<p>In recent correspondence, L. Ye-Wei and J. Wei have shown two counterexamples that contradict theorems four and five of a paper by J.E. Smith. In his reply, Smith stated an additional condition under which the theorems hold good. The commenters provide a counterexample that contradicts Smith's modified theorem five. They provide another counterexample that contradicts theorem three of Smith's original paper. In his reply, Smith corrects an error in his treatment.</p>
fault detection; programmable logic arrays; fault location; logic arrays.

J. Smith, N. Biswas and J. Jacob, "Further Comments on 'Detection of Faults in Programmable Logic Arrays' by J.E. Smith," in IEEE Transactions on Computers, vol. 39, no. , pp. 155-156, 1990.
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