using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var possibleList = new[] {          

            new[] {"A","B","C","D"},

            new[] {"A","B","C"}

        };

        var input = "A;C;D;B;";

        Console.WriteLine(input);

        var inputs = input.Split(new[] {';'}, StringSplitOptions.RemoveEmptyEntries);

        var match = (from list in possibleList

                where list.OrderBy(x => x).SequenceEqual(inputs.OrderBy(x => x))

                select list).FirstOrDefault();

​

        if (match == null)

            Console.WriteLine("not matched");

        else

            Console.WriteLine(String.Join(", ", match));

    }

}