In this paper we construct inequivalent Hadamard matrices based on Yang multiplication methods for base sequences.
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Due to unavoidable circumstances, journal publications experienced a temporary suspension, during which misleading domains such as https://combinatorialpress.com/um/ (see in this all journals are clone) and www.combinatorialmath.com appeared. While the latter remained dormant, the former, under the guise of Utilitas Mathematica, disseminated unverified content that does not uphold the true legacy of Utilitas Mathematica.
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