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REWIND IT AGAIN!!

Previous; http://steamproxy.com/sharedfiles/filedetails/?id=1288998658

Some of you may think the previous one was a piece of cake--- even you solved it without loosening any part of the spring.

OK, Another alchemist did a quite similar mistake. But this time, the reagent was a chain of precious metals(copper -> silver -> gold), not a metal. For its enantiomeric elements arrangement, it seems thing doesn't go easy as before...

Can you correct his mistake wisely again?