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Sums a sequence of decimal digits by repeatedly adding pairs of digits resulting in a single digit result.
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// The input sequence is expected to contain only integers between 0 - 9. let condense digits = digits |> Seq.reduce (fun x y -> [|0;1;2;3;4;5;6;7;8;9;1;2;3;4;5;6;7;8;9|].[x + y]) // e.g. condense [1;2;3;4;5;6;7;8;9;] gives a result 9
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