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defmodule Test do def gcd(a, b) do if b > 0 do gcd(b, rem(a, b)) else a end end end IO.puts("test") n = 1000 a = Enum.to_list(0..n-1) IO.puts(Enum.reduce(a, 0, fn (i, s) -> s + Enum.reduce(a, 0, fn (j, s) -> s + Test.gcd(i, j) end) end))