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\section{First section}\label{sec1}
Math is hard \cite{bertsekasII,rosolia2018data,herlau}, see also \cref{eq1} and \cref{fig1}.
\begin{equation}
	2+2 = 4 \label{eq1}
\end{equation}
\begin{figure}\centering
\includegraphics[width=.8\linewidth]{br}\caption{A figure}\label{fig1}
\end{figure}

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