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<p>For some URL like <a href="https://sourceforge.net/directory/artificial-intelligence/windows/">https://sourceforge.net/directory/artificial-intelligence/windows/</a>, it is equal to <a href="https://sourceforge.net/directory/?topic=artificial-intelligence&amp;os=windows">https://sourceforge.net/directory/?topic=artificial-intelligence&amp;os=windows"</a>, thus subscribing to <code>/sourceforge/topic=artificial-intelligence&amp;os=windows</code>.</p> <p>URL params can duplicate, such as <co...