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Generator matrices of some codes obtained in the manuscript
"An Altered Four Circulant Construction for Self-Dual codes from Group Rings and new extremal binary self-dual codes II"
by J. Gildea, A. Kaya, A. Tylyshchak, B. Yildiz.
Binary matrices of new extremal binary self-dual codes of length 68 in TABLE 17
Binary matrices of new extremal binary self-dual codes of length 68 in TABLE 18
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