new file mode 100644

@@ -0,0 +1,25 @@

+digraph G {

+size="6,6";

+	a -> b -> c;

+

+	subgraph cluster0 {

+		x0 -> y0;

+		x0 -> z0;

+	}

+

+	subgraph cluster1 {

+		x1 -> y1;

+		x1 -> z1;

+	}

+

+	subgraph cluster2 {

+		x2 -> y2;

+		x2 -> z2;

+	}

+

+	a -> x0;

+	b -> x1;

+	b -> x2;

+	a -> z2;

+	c -> z1;

+}