\begin{tikzpicture}[scale=0.70,auto]
\node[vertex] (v0) at (1.50,0) {};
\node[vertex] (v1) at (1.50,1) {};
\path[compup] (v0) -- (v1);

\node[vertex] (v2) at (1.50,2) {};
\node[vertex] (v3) at (1.50,3) {};
\path[compdown] (v2) -- (v3);

\node[vertex] (v4) at (3.00,1) {};
\node[vertex] (v5) at (3.00,2) {};
\path[compdown] (v4) -- (v5);

\node[vertex] (v6) at (4.50,0) {};
\node[vertex] (v7) at (4.50,2) {};
\path[compup] (v6) -- (v7);

%\node[vertex] (v8) at (4.50,2) {};
%\node[vertex] (v9) at (4.50,3) {};
%\path[compup] (v8) -- (v9);

\node[vertex] (v10) at (6.00,1) {};
\node[vertex] (v11) at (6.00,2) {};
\path[compup] (v10) -- (v11);

\path[edge] (0,0) -- (7.50,0);
\path[edge] (0,1) -- (7.50,1);
\path[edge] (0,2) -- (7.50,2);
\path[edge] (0,3) -- (7.50,3);
\end{tikzpicture}
