Hand trace a 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));
```
The stack, after each operation (top of stack on the left):
4
3 4
4
7 4
2 7 4
5 2 7 4
9 5 2 7 4
5 2 7 4
3 5 2 7 4
9 3 5 2 7 4
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