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Simple Solve #7.2: Old Memories

After getting back on track from "Test Review Offices" you find yourself, back? This test, this chamber, the same one, it has been forgotten, the acid was moved elsewhere, and everything else.. left to rot. BUT! It seems construction for something else has happened where the acid was. Maybe this could have you back to "Clean" Aperture?
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7.1 - https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3390034891

7.2 - https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3390036872

7.3 - https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3390038116