A circular linked list can have only one reference direction (as with a linked list) or a double reference (as with a doubly linked list). The only difference between a circular linked list and a linked list is that the last element's next (tail.next) pointer does not make a reference to undefined, but to the first element (head), as we can see in the following diagram:
A doubly circular linked list has tail.next pointing to the head element, and head.prev pointing to the tail element:
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