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\documentclass{article} \usepackage{expl3} \ExplSyntaxOn \cs_new:Npn \astsInner #1 {\prg_replicate:nn {#1} {*}} \ExplSyntaxOff \newcommand\astsExpliii[1]{\edef\asts{\astsInner{#1}}} \begin{document} \astsExpliii{10000} \end{document}