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<!DOCTYPE html> <html> <head> <title>Title of the document</title> </head> <body> <h1>First-level heading</h1> <h2>Second-level heading</h2> <h3>Third-level heading</h3> <h4>Fourth-level heading</h4> <h5>Fifth-level heading</h5> <h6>Sixth-level heading</h6> </body> </html>