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![ContractedBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![dot.gif](https://www.cnblogs.com/Images/dot.gif)
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![InBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![ContractedSubBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![dot.gif](https://www.cnblogs.com/Images/dot.gif)
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![InBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![ExpandedSubBlockStart.gif](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![ContractedSubBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![dot.gif](https://www.cnblogs.com/Images/dot.gif)
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![ExpandedSubBlockStart.gif](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![InBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![ExpandedSubBlockStart.gif](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![ContractedSubBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
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![ContractedSubBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![dot.gif](https://www.cnblogs.com/Images/dot.gif)
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![ExpandedSubBlockStart.gif](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![dot.gif](https://www.cnblogs.com/Images/dot.gif)
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![ExpandedSubBlockStart.gif](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![ContractedSubBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![dot.gif](https://www.cnblogs.com/Images/dot.gif)
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![InBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![ExpandedSubBlockStart.gif](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![ContractedSubBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![dot.gif](https://www.cnblogs.com/Images/dot.gif)
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![InBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![ExpandedSubBlockEnd.gif](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
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![InBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![InBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![ExpandedSubBlockStart.gif](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![ContractedSubBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![dot.gif](https://www.cnblogs.com/Images/dot.gif)
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![InBlock.gif](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![ExpandedBlockEnd.gif](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
We can see three design principle:
1.Identify the aspects of your application that vary and separate them from what stays the same.
2.Program to an interface, not an implemention.
3.Favor composition over inheritance.
Can you see it?