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+\begin{axiom}\label{cons}
+ $x\in \cons{y}{X}$ iff $x = y$ or $x\in X$.
+\end{axiom}
+
+\begin{definition}\label{unit}
+ $\unit = \{\emptyset\}$.
+\end{definition}
+
+\begin{proposition}\label{emptyset_in_unit}
+ $\emptyset\in\unit$.
+\end{proposition}