public Teacher(string grade, Borrower borrower) { this.Grade = grade; this.Borrower = borrower; }
public Borrowing(Borrower borrower, Work work, string date) { this.Borrower = borrower; this.Work = work; this.Date = date; }
public Student(Borrower borrower, string specialty, string level) { this.Specialty = specialty; this.Level = level; this.Borrower = borrower; }