[-7, -8, -9] -> [-7, -8, -9]
[[-7], -8, -9] -> [[-7], -8, -9]
[-7, -8, [-9]] -> [-7, -8, [-9]]
[-7, [-8], -9] -> [-7, [-8], -9]
[[-7], [-8], -9] -> [[-7, -8], -9]
[-7, [-8], [-9]] -> [-7, [-8, -9]]
[[-7], [-8], [-9]] -> [[-7, -8, -9]]
[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] -> [[0, 0], 0]
[0, [0], [0]] -> [0, [0, 0]]
[[0], [0], [0]] -> [[0, 0, 0]]
[0] -> [0]
[[0]] -> [[0]]
[4, 3, [-1], [0], [1], 3, 4] -> [4, 3, [-1, 0, 1], 3, 4]