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public List<Student> Students { get; set; } = new List<Student>
        {
            new Student { IndexNumber = "KOSZ001", FirstName = "Kaczor", LastName="Donald" },
            new Student { IndexNumber = "KOSZ002", FirstName = "Myszka", LastName="Miki" },
            new Student { IndexNumber = "KOSZ003", FirstName = "Koziolek", LastName="Matolek" },
            new Student { IndexNumber = "KOSZ004", FirstName = "Smok", LastName="Wawelski" },
            new Student { IndexNumber = "KOSZ005"