diff --git a/presentation/automata.pdf b/presentation/automata.pdf
index 9301e92..5ecaf34 100644
Binary files a/presentation/automata.pdf and b/presentation/automata.pdf differ
diff --git a/presentation/automata.tex b/presentation/automata.tex
index 90feb62..41c2272 100644
--- a/presentation/automata.tex
+++ b/presentation/automata.tex
@@ -704,4 +704,88 @@
 		$\tVarX\{\ta \ror \epsilon\} \cdot \tVarX\{\tb \ror \epsilon\}$
 	\end{center}
 
+
+	\pagebreak
+
+	~\newline	
+	\begin{center}
+		\begin{tikzpicture}[node distance=10mm,on grid,>=stealth',auto, 
+		state/.style={rectangle,draw=black,inner sep=2pt,minimum size=4mm}]
+		\node         (start)                 				{};
+		\node[state]  (a1)     [right=of start] 				{$\ta$};	
+		\node[state] (a2) [below=of a1]	{$\ta$};
+		\node 				(end)   [right=of a1]	   	{};
+		
+		\draw[fill=black] (start) circle (0.5mm);
+		\draw[fill=black] (end) circle (0.5mm);
+		\draw 						(end) circle (1mm);
+		
+		\path[->]
+		(start.center) edge node[above, left=-5pt,very near end,yshift=1mm] {} (a1)
+		(start.center) edge[] node[] {} (a2)
+		(a1) edge[] node[above, left=-5pt,very near end,yshift=1mm] {} (end.west)
+		(a2) edge (end.west);
+		\end{tikzpicture}
+		
+	\end{center}
+	\vspace{-15pt}
+	\begin{center}
+		$\ta \ror \ta$
+	\end{center}
+
+	~\newline	
+	\begin{center}
+		\begin{tikzpicture}[node distance=10mm,on grid,>=stealth',auto, 
+		state/.style={rectangle,draw=black,inner sep=2pt,minimum size=4mm}]
+		\node         (start)                 				{};
+		\node[state]  (a1)     [right=of start] 				{$\ta$};	
+		\node[state] (a2) [below=of a1]	{$\ta$};
+		\node 				(end)   [right=of a1]	   	{};
+		
+		\draw[fill=black] (start) circle (0.5mm);
+		\draw[fill=black] (end) circle (0.5mm);
+		\draw 						(end) circle (1mm);
+		
+		\path[->]
+		(start.center) edge node[above, left=-5pt,very near end,yshift=1mm] {} (a1)
+		(start.center) edge[] node[] {} (a2)
+		(a1) edge[] node[above, left=-5pt,very near end,yshift=1mm] {} (end.west)
+		(a2) edge (end.west);
+		\end{tikzpicture}
+		
+	\end{center}
+	\vspace{-15pt}
+	\begin{center}
+		$\ta \ror \ta$
+	\end{center}
+
+	~\newline	
+	\begin{center}
+		\begin{tikzpicture}[node distance=10mm,on grid,>=stealth',auto, 
+		state/.style={rectangle,draw=black,inner sep=2pt,minimum size=4mm}]
+		\node         (start)                 				{};
+		\node[state]  (a1)     [right=of start] 				{$\ta$};	
+		\node[state] (b) [right=of a1]	{$\tb$};
+		\node[state] (refX) [right=of b] {$\tRefX$};
+		\node 				(end)   [right=of refX]	   	{};
+		
+		\draw[fill=black] (start) circle (0.5mm);
+		\draw[fill=black] (end) circle (0.5mm);
+		\draw 						(end) circle (1mm);
+		
+		\path[->]
+		(start.center) edge node[above, left=-5pt,very near end,yshift=2mm] {o(x)} (a1)
+		(a1) edge[] node[above, left=-6.5pt,very near end,yshift=2mm] {c(x)} (b)
+		(b) edge[bend right=120] node[above, yshift=-1mm] {o(x)} (a1)
+		(b) edge[bend right=45] node[below] {} (end.west)
+		(b) edge (refX)
+		(refX) edge (end.west);
+		\end{tikzpicture}
+		
+	\end{center}
+	\vspace{-15pt}
+	\begin{center}
+		$(\tVarX \{ \ta \} \cdot \tb)^+ \cdot (\tRefX \ror \epsilon)$
+	\end{center}
+
 \end{document}