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path: root/graphics/pgf/contrib/pgf-umlsd/demo/prelevel.tex
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\begin{sequencediagram}
  \newthread{t1}{:Thread1}
  \newthread[gray]{t2}{:Thread2}

  \begin{callself}{t1}{loop}{}
  \end{callself}

  \prelevel\prelevel

  \begin{callself}{t2}{loop}{}
  \end{callself}
\end{sequencediagram}