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have you cheker challenge http://coord.info/GC5DQ23
Herewith the checker
and here the Html which you can use for your listing
<a href="http://project-gc.com/Challenges/GC5DQ23/2804"><img src="http://maxcdn.project-gc.com/Images/Checker" title="Project-GC Challenge checker" alt="PGC Checker"></a>