A note on the Assmus–Mattson theorem for some binary codes II
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Let C be a four-weight code, which has all one vector. Furthermore, we assume that C_ℓ are t-designs for all ℓ by the Assmus–Mattson theorem. We previously showed that t≤ 5. In the present paper, we show an analogue of this result in the cases of five and six-weight codes.
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