1
2
3
1
1
1
1	4
2	5
3	6
1
2
3
1	[4,5,6]
2	[4,5,6]
3	[4,5,6]
1	4	[1,2,3]	[4,5,6]
2	5	[1,2,3]	[4,5,6]
3	6	[1,2,3]	[4,5,6]