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    private static readonly string[] FiCheckChars = new string[] {"0","1","2","3","4","5","6","7","8",
                                                                  "9","a","b","c","d","e","f","h",
                                                                  "j","k","l","m","n","p","r",
                                                                  "s","t","u","v","w","x","y"};

    public bool IsCivicRegistrationNumberValid(string civicNumber)
    {
        if (civicNumber == null)
            return false;

        var cleanedCivicNumber = civicNumber.Replace("-", "");

        if (cleanedCivicNumber.Length != 10)
            return false;

        if (!IsDateValid(cleanedCivicNumber.Substring(0, 6), "ddMMyy", "fi-FI"))
            return false;

        // Valid check character? 
        var vNr = double.Parse(cleanedCivicNumber.Substring(0, cleanedCivicNumber.Length - 1));
        var vCheck = (int)(vNr % 31);
        var letterCheck = cleanedCivicNumber.ToLower().Substring(cleanedCivicNumber.Length - 1);

        return FiCheckChars[vCheck] == letterCheck;
    }

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