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@ -28,4 +28,4 @@ Use the Null Object pattern when
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## Credits
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* [Pattern Languages of Program Design](http://www.amazon.com/Pattern-Languages-Program-Design-Coplien/dp/0201607344/ref=sr_1_1)
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* [Pattern Languages of Program Design 3](https://www.amazon.com/gp/product/0201310112/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0201310112&linkCode=as2&tag=javadesignpat-20&linkId=7372ffb8a4e39a3bb10f199b89aef921)
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