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\begin{tabular}{ccc}
\begin{enumerate}
\item Test&\item TestII&\item TestIII\\
\end{enumerate}
\end{tabular}

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\newcounter{num}
\setcounter{num}{1}

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\newcommand{\nummer}{\thenum. \stepcounter{num} }

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\begin{tabular}{ccc}
\nummer Test & \nummer TestII & \nummer TestIII\\
\end{tabular}