Question: Use a doubly linked list to implement the sequence class from Section 4.5. With a doubly linked list, there is no need to maintain a

Use a doubly linked list to implement the sequence class from Section 4.5. With a doubly linked list, there is no need to maintain a precursor. Your implementation should include a retreat member function that moves the cursor backward to the previous element. Also, use a dummy head and a dummy tail node. The data in these dummy nodes can be the Java constant Double.NaN, which is used for a double variable that is “not a number.”

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