Too many levels of nested for loops

General Usage
4

you can use Iterators.product:

s = 0
for (i1,i2,i3,i4) in Iterators.product(1:4, 1:4, 1:4, 1:4)
    s += i1 + i2 + i3 + i4
end
s

or with an arbitrary number of nested loops:

N = 4
s = 0
for i in Iterators.product(fill(1:4, N)...)
    s += sum(i)
end
s
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