main.tex

\documentclass{article}

\usepackage{tikz}

\begin{document}
    \framebox{
    \begin{tikzpicture}
        \draw [thick] (0,0) to [bend left=50] (0,10);
        \draw [thick] (3,0) to [bend left=70] (3,10);
        \draw [thick] (5,2) to [bend left=90] (5,8);
        %\draw [thick] (3,2) to [bend left] (3,8);
        %\draw [thick] (4,4) to [bend left] (4,6);
    \end{tikzpicture}
}
\end{document}