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Chapter 21 Software Maintenance 561 21.7 Discuss the similarities and differences between the patterns in each of the following pairs. Describea unique situation in which

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Chapter 21 Software Maintenance 561 21.7 Discuss the similarities and differences between the patterns in each of the following pairs. Describea unique situation in which one of the patterns should be applied and the other should not be applied 1. Facade and mediator 2. Builder and facade 3. Observer and mediator 4. Facade and proxy

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