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POSTSCRIPT arrays, strings, and dictionaries are examples of composite objects. These objects have values that are separate from the object itself. That is, the character codes making up a string are stored in a different location in a POSTSCRIPT machine than the string object that POSTSCRIPT directly manipulates. Note that composite objects can share values. A dup operation on a string duplicates the object, but not its value. The duplicate object looks to the same place in the machine’s memory for its value.