In a circular doubly-linked list, the previous reference of the first node points to the last node,

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In a circular doubly-linked list, the previous reference of the first node points to the last node, and the next reference of the last node points to the first node. Change the doubly-linked list implementation of Worked Example 16.1 into a circular list. You should remove the last instance variable because you can reach the last element as first.previous.

Data from worked example 16.1.

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