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\chapter*{Supervisors' signatures}

	\paragraph{}
	\begin{center}
	 \bfseries Mr. Tarek Aroui\\
	 \mdseries ENISO 
	 
	 
	\end{center}

\vspace{5cm}


	\paragraph{}
	\begin{center}
	 \bfseries Ms. Wafa Mbarek\\
	 \mdseries Infor
	 
	 
	\end{center}