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diff --git a/test/examples/byRef.tex b/test/examples/byRef.tex
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+\begin{proposition}\label{first_proposition}
+    $a = a$.
+\end{proposition}
+
+\begin{proposition}\label{second_proposition}
+    $b = b$.
+\end{proposition}
+
+\begin{proposition}\label{third_proposition}
+    $c = c$.
+\end{proposition}
+\begin{proof}
+    Follows by \ref{first_proposition}. % Should filter out second_proposition
+\end{proof}
+
+\begin{proposition}\label{fourth_proposition}
+    $e = e$.
+\end{proposition}
+\begin{proof}
+    For all $d$ we have $d = d$ by \ref{first_proposition}.
+\end{proof}
+
+\begin{proposition}\label{fifth_proposition}
+    $f = f$.
+\end{proposition}