[]
[5]
[1]
[4,4]
[1,2]
[1,2,3]
[7,7,7,7]
[1,2,3,4]
[1,2,3,4,5]
[5,4,3,2,1]
[0,0,1,1,2,2]
[1,2,3,4,5,6]
[-3,0,7]