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An extension theorem for [n, k, d] q codes with gcd(d, q) = 2 Abstract As a continuation of Maruta [Finite Fields Appl. 10 (2004), 674–685], we investigate the extendability of [n, k, d] q codes with d ≡ −2 (mod q) whose weights are congruent to 0, −1 or −2 (mod q) for even q ≥ 4. We show that such codes are extendable for all even q ≥ 8, giving a new(More)
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