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If the $p$-rank $\\gamma(\\mathcal{X})$ equals $g(\\mathcal{X})$, then $\\mathcal{X}$ is \\emph{ordinary}. In this paper, we deal with \\emph{large} automorphism groups $G$ of ordinary curves of even genus. We prove that $|G| < 821.37g(\\mathcal{X})^{7/4}$. 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