Hand trace an initially empty stack X through the following operations:
X.push(new Integer(4));X.push(new Integer(3));Integer Y = X.pop();X.push(new Integer(7));X.push(new Integer(2));X.push(new Integer(5));X.push(new Integer(9));Integer Y = X.pop();X.push(new Integer(3));X.push(new Integer(9));
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