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Some optimal rate-1/2quasi-cyclic codes found by Chert et aL [3] are grouped into a small set of equivalence classes with the assistance of a computer. The weight distribution of a selection of these rate-1/2codes is tabulated. In addition, a list of new optimal rate-2/3quasi-cyclic codes of lengths up to 54 is presented.
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Tavares et al. (1974) studied this question.
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