5
8
000 000 000
0 1
0 2
0 3
1 2
1 3
2 3
2 4
3 4
1 2 3 4 5 6 7 8

			(4)
		   ^   ^	
		  /     \
		 7		 8 
		/         \
	  (2)----6--->(3)
	   ^  ^      ^ ^
	   |   \    /  |
	   2    4  3   5
	   |     \/    |
	   |     /\    |
	   |    /  \   |
	   |   /    \  |
	   |  /      \ |
	  (0)----1--->(1)