种豆南山下,草盛豆苗稀。
晨兴理荒秽,带月荷锄归。
道狭草木长,夕露沾我衣。
衣沾不足惜,但使愿无违。
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http://www.runoob.com/design-pattern/composite-pattern.html
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https://blog.csdn.net/hguisu/article/details/7530783
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https://blog.csdn.net/hguisu/article/details/7535792
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http://www.runoob.com/design-pattern/flyweight-pattern.html
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https://www.jianshu.com/p/b4c371128e6f
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