// Red Black Tree Example

digraph G {
	graph [ratio=.48];
	node [style=filled, color=black, shape=circle, width=.6 
		fontname=Helvetica, fontweight=bold, fontcolor=white, 
		fontsize=24, fixedsize=true];
	{rank = same; n1; 6; n4; n5; n6; n7; 22; 27};
	
	6, 8, 17, 22, 27
	[fillcolor=red];
	
	n1, n2, n3, n4, n5, n6, n7, n8, n9, n10, n11
	[label="NIL", shape=record, width=.4,height=.25, fontsize=16];
	
	13 -> 8, 17;
	8 -> 1 [weight=6]; 
	8 -> 11 [weight=5];
	17 -> 15 [weight=4]; 
	17 -> 25 [weight=5];
	1 -> n1 [weight=7]; 
	1 -> 6;
	11 -> n4 [weight=10]; 
	11 -> n5 [weight=14];
	6 -> n2, n3;
	15 -> n6 [weight=14]; 
	15 -> n7 [weight=10];
	25 -> 22; 
	25 -> 27 [weight=6];
	22 -> n8 [weight=5]; 
	22 -> n9 [weight=3];
	27 -> n10 [weight=3];
	27 -> n11 [weight=5];
}