[2, [1]]
[0]
[16, [4]]
[0]
[28, [2, 3, 4]]
[0]
[20, [2], [4]]
[0]
[0]
[0]
[0]
[12, [2], [3]]
[28, [2, 4], [3]]
[8, [3]]
[2, [1]]
[0]
[2, [1]]
[0]
[0]
[24, [3], [4]]
48