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\begin{minipage}[b]{0.45\linewidth}
\begin{tcolorbox}[title=Problem, colbacktitle=red!70!black,colback=red!20!white]
We cannot just go and test digital twins on large systems, because we do not have large systems at hand.
- Moreover, real-world experimentation is costly and unsustainable in the long run.
+ Moreover, real-world experimentation is costly and unsustainable in the long run~\cite{DBLP:conf/ccgrid/MastenbroekAJLB21}.
\end{tcolorbox}
\vspace{0.5cm}
\begin{tcolorbox}[title=Solution, colbacktitle=Green!70!black, colback=Green!20!white]