function
to_str : int * list(int * string) => string
to_str((_, [(_, s1)])) = s1
to_str((_, [(_, s1), (_, s2)])) = String.concat(s1, s2)
to_str((x, _)) = Int.to_str(x)
entrypoint fizz_buzz(to : int) : list(string) =
let fizz_or_buzz = (x) => [ (m, s) | (m, s) <- [(3, "Fizz"), (5, "Buzz")], if(x mod m == 0) ]
[ to_str((x, fizz_or_buzz(x))) | x <- [1..to] ]
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