\setcounter{chapter}{0} % Reset the chapter counter to 0
\renewcommand{\thechapter}{\Alph{chapter}}
\part{APPENDIX}
\chapter{Supplementary Materials}
\label{a1}


\section{Appendices I - Chapter 2}

\verb|https://github.com/Luis93A/ITShoe|

\begin{minipage}{\linewidth}
  \centering
  \includegraphics[width=0.4\linewidth]{tex/contents/fig/a1.png}
\end{minipage}

\section{Appendices II - Chapter 4}

\verb|https://github.com/Luis93A/lstm-data|

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  \centering
  \includegraphics[width=0.4\linewidth]{tex/contents/fig/a4.png}
\end{minipage}%

\section{Appendices III - Chapter 5}

\verb|https://github.com/Luis93A/walking-controllers|

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  \centering
  \includegraphics[width=0.4\linewidth]{tex/contents/fig/a2.png}
\end{minipage}%

\vspace{0.5cm}

\verb|https://github.com/Luis93A/PID_slipperyfloor_NAO_matlab|

 \begin{minipage}{\linewidth}
  \centering
  \includegraphics[width=0.4\linewidth]{tex/contents/fig/a3.png}
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