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In the last lesson, we talked about design, and we saw how difficult it can
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be to come up with a good and effective design for a given software system. To
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help address these difficulties, we will discuss
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design patterns, which can support design activities by
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providing general, reusable solutions to commonly occurring design
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problems. Similar to architectural styles, design patterns can
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help developers build better designed systems by reusing design solutions that
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worked well in the past and by building on those solutions.
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