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Ilkka Seppälä 2014-08-22 21:59:58 +03:00
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##Memento
**Intent:** Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later.
##Observer
**Intent:** Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.