Custom 404 page not comming in WordPress

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Guys recently i have shifted from blogger to wordpress and still now every thing went very smooth except there was once problem when i was trying to setup my 404 page. By default wordpress redirects all unknown url to 404.php but if you have a 404 page there and its not showing up then this is what you need to do. Just navigate to Settings --> Permalink and select anything except the default option.
404 page should come up. :-)