[0]
[0,0,0]
[0,0,0,0,0]
[0,0,0,0,0,0,0]
[0,0,0,0,0,0,0,0,0]
[0]
[0,2,4]
[0,2,4,6,8]
[0,2,4,6,8,10,12]
[0,2,4,6,8,10,12,14,16]
[0]	[0]
[0,1,2]	[0,2,4]
[0,1,2,3,4]	[0,2,4,6,8]
[0,1,2,3,4,5,6]	[0,2,4,6,8,10,12]
[0,1,2,3,4,5,6,7,8]	[0,2,4,6,8,10,12,14,16]