--- /dev/null
+\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}