add extensionmethod
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		@@ -207,6 +207,7 @@
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                    <a class="bookmark" href="https://github.com/" ><p class="box">Github</p></a>
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                    <a class="bookmark" href="https://gist.github.com/" ><p class="box">gisthub</p></a>
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                    <a class="bookmark" href="https://regex101.com/" ><p class="box">regex101</p></a>
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                    <a class="bookmark" href="http://extensionmethod.net/csharp" ><p class="box">extensions</p></a>
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                </div>
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            </div>
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        </div>
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