\documentclass{standalone}
\usepackage{tikz}
\begin{document}

\[	
	\begin{tikzpicture}
\coordinate (1) at (0,0) {};
\coordinate (2) at (0,1) {};
\coordinate (3) at (1,1) {};
\coordinate (4) at (1,2) {};
\coordinate (5) at (2,2) {};
\draw (1) -- (2);
\draw (3) -- (2);
\draw (3) -- (4);
\draw (5) -- (4);
\end{tikzpicture}
\]


\end{document}
