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    // Task 2
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    let x1 = [ ('a',1); ('b',2); ('c',3); ('d',4) ] // (<масть>,<достоинство>)
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    let search A = 
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        A |> List.filter (fun (x,y) -> x='a')
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    printfn "%A" (search x1)
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    printf "%d\n" (search x1).Length