c# record

public record Person(string FirstName, string LastName);

public record Teacher(string FirstName, string LastName,
    string Subject)
    : Person(FirstName, LastName);

public sealed record Student(string FirstName,
    string LastName, int Level)
    : Person(FirstName, LastName);

public sealed record Student : Person
{
    public int Level { get; }

    public Student(string first, string last, int level) : base(first, last) => Level = level;
}

public record Teacher : Person
{
    public string Subject { get; }

    public Teacher(string first, string last, string sub)
        : base(first, last) => Subject = sub;
}

public record Person
{
    public string LastName { get; }
    public string FirstName { get; }

    public Person(string first, string last) => (FirstName, LastName) = (first, last);
}