
        \documentclass{article}
        \usepackage{pdfpages} % for \includepdf[pages=-]

        \begin{document}
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\includepdf[pages={55,53}, nup=1x2,landscape=true]{calender.pdf}
\includepdf[pages={54,54}, nup=1x2,landscape=true]{calender.pdf}

        \end{document}
    