On Fri, 20 Jun 2008 11:46:07 +0100, Invisible <voi### [at] devnull> wrote:

>scott wrote:
>
>> Locks can be designed to be opened by two different keys (usually a 
>> unique key and a master key common to several locks).
>
>Really? Hmm... sounds physically implausible to me, but OK.

That is because you don't know how a lock and key work. They are very
simple physical devices.
-- 

Regards
     Stephen

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