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inspect source code (see 8023_1.png and 8023_2.png)
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the code is matched against a generated string (
testcode)
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the page is built from javascript, so debugging is not possible
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copy the generation code of
testcode to execute it in the console (or build it manually) (see 8023_3.png)
enter the code and access the page (see 8023_4.png)