Hand trace an unordered list through the following operations.
X.addToFront(new Integer(4));
X.addToRear(new Integer(7));
Object Y = X.first();
X.addAfter(new Integer(3), new Integer(4));
X.addToFront(new Integer(2));
X.addToRear(new Integer(5));
Object Y = X.removeLast();
Object Y = X.remove(new Integer(7));
X.addAfter(new Integer(9), new Integer(3));