Towards a Visitor solution

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Abstract classes, Interfaces, and Patterns - slide 35 : 37

Towards a Visitor solution

The transition from natural object-oriented traversals to Visitor

Steps:
- A Visitor interface and three concrete Visitor classes are defined
- The Intsequence classes are refactored - the traversal methods are moved to the visitor classes
- Accept methods are defined in the IntSequence classes. Accept takes a Visitor as parameter
- Accept passes this to the visitor, which in turn may activate Accept on components

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