Remove all hosts which are not in bb-hosts or it's includes

Hi

How can I automatically remove all history and other data from hosts which are not in one or any bb-hosts file any more.

Thanks Thorsten Erdmann ITI/EP68 Mercedes Benz Werk Hamburg Tel.: +49-40-7920-2593 mobil: +49-160-8614383 Lotus-Fax:+49-711-1779043874 mail: thorsten.erdmann at daimler.com

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