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Difference between Page list and Page group?

1) Page List mode property is a data structure consisting of an ordered list of zero or more pages, each identified by an integer index (starting with 1).

2) A Page Group is a data structure consisting of an unordered set of pages, each identified by a string subscript value.
For example, a Page Group property can contain an array of 50 pages, one for each state in the United States,
indexed by state code. The reference: State(“VA”).Population can identify a numeric property for the state of Virginia.
In contrast, a Page List data structure uses numeric indexes (subscripts) 1, 2, 3 to identify an ordered list of pages.
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