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open System.IO
let solution n =
Seq.windowed n
>> Seq.findIndex (Set >> Set.count >> (=) n)
>> (+) n
assert
[ ("mjqjpqmgbljsphdztnvjfqwrcgsmlb", 7, 19)
("bvwbjplbgvbhsrlpgdmjqwftvncz", 5, 23)
("nppdvjthqldpwncqszvftbrmjlhg", 6, 23)
("nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg", 10, 29)
("zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw", 11, 26) ]
|> List.forall (fun (test, s4, s14) -> solution 4 test = s4 && solution 14 test = s14)
let input = File.ReadAllText "input.txt"
printfn "%d" <| solution 4 input
printfn "%d" <| solution 14 input
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