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- In a singly-linked list, each node in the list has one pointer
- that points to the next node in the list. In a doubly-linked
- list, each node in the list has two pointers, one that points to
- the next node in the list, and one that points to the previous
- node. The advantage of a doubly-linked list is that the second
- pointer makes some operations easier to implement. The advantage
- of the singly-linked list is that each node is smaller.
-