Question: In the LinkedList implementation of Section 16.1, we use a flag isAfterNext to ensure that calls to the remove and set methods occur only when

In the LinkedList implementation of Section 16.1, we use a flag isAfterNext to ensure that calls to the remove and set methods occur only when they are allowed. It is not actually necessary to introduce a new instance variable for this check. Instead, one can set the previous instance variable to a special value at the end of every call to add or remove. With that change, how should the remove and set methods check whether they are allowed?

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