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diff --git a/test/examples/finite-set-terms.tex b/test/examples/finite-set-terms.tex
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@@ -1,3 +1,7 @@
+\begin{signature}\label{example_cons}
+ $\cons{y}{X}$ is a set.
+\end{signature}
+
\begin{axiom}\label{cons}
$x\in \cons{y}{X}$ iff $x = y$ or $x\in X$.
\end{axiom}