public DLinkedList choose (char poly) {

        DLinkedList n = new DLinkedList();
        if (poly == 'A') {

            n = A;
        }
        else if (poly == 'B') {

            n = B;
        }
        else if (poly == 'C') {

            n = C;
        }
        return n;
    }



DLinkedList A = new DLinkedList();
    DLinkedList B = new DLinkedList();
    DLinkedList C = new DLinkedList();
    DLinkedList R = new DLinkedList();