static void Main(string[] args) { var student1 = new Student("Bob", new Knowledge(1)); var student2 = new Student("Martin", new Knowledge(5)); var student3 = new Student("Alex", new Knowledge(4)); University university = new University("CH.U.I."); university.AddStudent(student1); university.AddStudent(student2); university.AddStudent(student3); Internship internship = new Internship("Interlink"); internship.AddInterns(university); Console.WriteLine("List of internship's students:"); Console.WriteLine(internship.GetInterns()); }