i = !0
j = !0
k = !0
l = !0
m = !0
for! [1, 2], _i =>
    for! [3, 4], _j =>
            for! [5, 6], _k =>

                i.inc!()


            j.inc!()

            k.inc!()
    l.inc!()

m.inc!()

assert i == 8
assert j == 4
assert k == 4
assert l == 2
assert m == 1