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diff --git a/test/phase5/exact-proof-parity-invalid-fix-shape.tex b/test/phase5/exact-proof-parity-invalid-fix-shape.tex
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+\begin{proposition}\label{invalid_fix_shape}
+    Let $A$ be a set.
+    $A=A$.
+\end{proposition}
+\begin{proof}
+    Fix $x\in A$.
+    Follows.
+\end{proof}