()
()[]()
[()()]
[()]()
)
(]
(()()]
())
(12)
(5 + 3) * [3 - 2] / (5 + 1)
1 / [(6 + 3) / (7 - 3) - 2]
[1 / (2 + 4) + 54] * (5 + 6)