diff --git a/report.tex b/report.tex
index 48759a0..2813dd8 100644
--- a/report.tex
+++ b/report.tex
@@ -822,15 +822,13 @@ $}
     $}
     \]
     where $c_1$, $c_2$, $c_3$ and $c_4$ are positive constants that large enough (the lower bound can be calculated). Thus we have constraint damping.
+  \end{frame}
 
-    \vspace{0.2cm}
+  \begin{frame}{Searching for a first order Z4c}{old workflow: by hand}
     {\color{red} \textbf{Unfortunately, this naive system is not even weakly hyperbolic!}}
     \vspace{0.2cm}
 
     We have to add some constraint terms that equals to zero, while contributes to the principal symbol, until the principal symbol matrix is diagonalizable with real eigenvalues.
-  \end{frame}
-
-  \begin{frame}{Searching for a first order Z4c}{old workflow: by hand}
     Available terms to add:
     \begin{gather*}
       \constraintA{_i} \qc \constraintB{^i_j} \qc \constraintC*{_i} \qc \constraintD*{_i_j_k},\\