[1,2]
[[],2,3]

[[],[8,[[5,10,5]],9]]
[[[[2,8,4],[2,0],4,6,4],2,[[10,5,10],1,[10,9,1,1]]],[2,7],[],[[[3,1,4,8,4],4,[0,5,9,3],4,[]],[],[8,2]]]

[[[],2],[0,6,[[2,7,7,2,4],[7,1]],6,2]]
[[3,[],[[10,2,1,5]]],[]]