The basic building block of a doubly linked structure is a node with two pointers: head, which points left; and tail, which points right.

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The basic building block of a doubly linked structure is a node with two pointers: one pointing to the next node in the sequence (often called "next") and the other pointing to the previous node (often called "prev"), not "head" and "tail" which typically refer to the first and last nodes of the entire structure, respectively.

The Basic Building Block of a Doubly Linked Structure Is