fn main() {
mut a := [1, 2]
a.insert(1, 2.3)
a.insert(1, 'abc')
a.insert(1, [1.1, 2.2])
a.insert(1, ['aa', 'bb', 'cc'])
a.insert(1, [[1]])
a.insert(1, [[['aa']]])
println(a)
mut b := [[1, 2, 3]]
b.insert(0, [[[2]]])
b.insert(0, [[[['aa']]]])
println(b)
}