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diff --git a/graphics/pgf/contrib/pgf-umlsd/demo/prelevel.tex b/graphics/pgf/contrib/pgf-umlsd/demo/prelevel.tex
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--- /dev/null
+++ b/graphics/pgf/contrib/pgf-umlsd/demo/prelevel.tex
@@ -0,0 +1,12 @@
+\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}