digraph G {
	graph [compound=true,
		concentrate=true
	];
	node [color="#909090",
		fontsize=8,
		height=0.1,
		label="\N",
		shape=box
	];
	edge [arrowsize=0.5,
		color="#808080",
		fontsize=8,
		style=dashed
	];

	{
		graph [rank=same];
		76;
		376;
		256;
		196;
		316;
	}
	376 -> 76	[label=to1];
	376 -> 256	[style=invis];
	376 -> 196	[label=to2];
	256 -> 376	[label=to1];
	316 -> 76	[style=invis];
}
