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I saw it sometimes when a plugin writer directly construct a permalink (also called item link) by doing this:

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echo "<a href=\"index.php?itemid=".$itemid."\">".$title."</a>";

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more...

Today, I learnt about a trick how to put a 2nd blog on its own dirs.

see here

Some links still broken because nudn/nudn is in the link instead of nudn/... still working on it. Now, all is working.