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% https://tex.stackexchange.com/q/155630/
\documentclass{article}
\usepackage{xsim}

\DeclareExerciseCollection{foo}

\begin{document}

\collectexercises{foo}
\begin{exercise}
  foo
\end{exercise}
\begin{exercise}
  bar
\end{exercise}
\begin{exercise}
  baz
\end{exercise}
\collectexercisesstop{foo}

% shuffle around for a different version:
\printexercise{exercise}{1}
\printexercise{exercise}{3}
\printexercise{exercise}{2}

\end{document}