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List processing is a list of programming codes, including abstract data structure, used to calculate specified variables in a certain order. A value may repeat more than once.
Inspection and enumeration of static list structures are the only allowed list processing operations, while item insertion, replacement and deletion operations are only allowed within dynamic lists processing operations.
Each finite sequence of variables, each with a certain mathematical formula, is an instance of the list and it is called a tuple.
The terms item, entry and element typically refer to the same thing - an instance of a value within the list. When the values occur repeatedly, each occurrence is considered an independent entity.
Abstract lists such as linked lists are implemented using many concrete data structures, each called a list.
List data type is supported within many programming languages, while specific syntax and semantics are used for those lists and their operations. Commas, semicolons and space separations are used to construct a list and distinguish its elements.
Indexing and slicing are possible operations, which may be carried on list types in some languages.