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<!DOCTYPE html PUBLIC "-//W3C//ENTITIES HTML MathML Set//EN//XML" "xhtml-local.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>XHTML Doctype Example 3</title> </head> <body> <div> <span id="nbsp">√</span> <span id="lang">⟨</span> </div> </body> </html>