making custom validate rule (NotEqualTo)

Hello!

I'm new to cakePHP and I would like to make a custom validate rule. I made a
page where there is a form with fields such as "name", "adress", etc. In the
field "City" there is only ONE city that is not allowed to apply - say,
"Forbidden City". I need a rule that is similar to "EqualTo", but the
opposite: when the name of the city is equalTo "Forbidden City", then there
would be an error message!

Something like "rule" => array("NotEqualTo", "Forbidden City").

Is there an easy way to do this? Can I somehow use the "EqualTo" rule?

THanks !!
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