It is a dynamic circular chain that formed by sequent lists and linked lists alternately.
Lists are linked lists of atoms, lists, or both.
They can be expressed as ordered vectors, unordered groups, linked lists, trees, graphs or other forms that the programming language supports.
The new additions to SPL add some useful functionality to PHP that is easy to use, as well as implementations of data structures, such as doubly linked lists, stacks, heaps, and queues.
On the basis of class and in accordance with the level structure and the inheritance relation of class, a rule base is constructed by using linked lists.
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