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main() {
a, b := reverse2(1, 2)
assert a == 2
assert b == 1
c, d, e := reverse3(1, 2, 3)
assert c == 3
assert d == 2
assert e == 1
f, g, h, i := mix4(1, 2, 3, 4)
assert f == 4 + 1
assert g == 3 + 2
assert h == 2 + 3
assert i == 1 + 4
}
reverse2(a, b) {
return b, a
}
reverse3(a, b, c) {
return c, b, a
}
mix4(a, b, c, d) {
return d + a, c + b, b + c, a + d
}