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Model classes represent problem domain data and operations (such as lists of people/departments/budgets; documents containing sections/paragraphs/footnotes of stylized text).
* View classes implement visual representations and affordances for human-computer interaction (such as scrollable grids of captioned icons and pop-up menus of possible operations).
* Controller classes contain logic that surfaces model data as view representations, maps affordance-initiated user actions to model operations, and maintains state to keep the two

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