diff --git a/figures/vertex_parallel.pdf b/figures/vertex_parallel.pdf
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Binary files /dev/null and b/figures/vertex_parallel.pdf differ
diff --git a/tikzs/vertex_parallel.tikz b/tikzs/vertex_parallel.tikz
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--- /dev/null
+++ b/tikzs/vertex_parallel.tikz
@@ -0,0 +1,29 @@
+\begin{tikzpicture}
+	\begin{pgfonlayer}{nodelayer}
+		\node [style=Medium dot] (1) at (2, 3) {};
+		\node [style=Medium dot] (2) at (-2, -3) {};
+		\node [style=none] (3) at (4, 7) {};
+		\node [style=none] (4) at (-4, -5) {};
+		\node [style=none] (5) at (2, -5) {};
+		\node [style=none] (6) at (8, 3) {};
+		\node [style=Medium dot] (7) at (-7, -1) {};
+		\node [style=none] (8) at (-7, 5.25) {};
+		\node [style=Medium dot] (9) at (0, 6) {};
+		\node [style=none] (10) at (2.25, 3.25) {$V_i$};
+		\node [style=none] (11) at (0.5, 6.5) {$V_{i-1}$};
+		\node [style=none] (12) at (-2, -3.75) {$V_{i+1}$};
+		\node [style=none] (13) at (-7.5, -1.5) {$V_{i+2}$};
+		\node [style=none] (14) at (3.25, 5.25) {$e_j$};
+	\end{pgfonlayer}
+	\begin{pgfonlayer}{edgelayer}
+		\draw [style=Very thick] (2) to (1);
+		\draw [style=Very thick] (4.center) to (3.center);
+		\draw (3.center) to (6.center);
+		\draw (6.center) to (5.center);
+		\draw (5.center) to (4.center);
+		\draw (8.center) to (9);
+		\draw (9) to (1);
+		\draw (2) to (7);
+		\draw (7) to (8.center);
+	\end{pgfonlayer}
+\end{tikzpicture}