Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A loophole is a weakness or exception that allows a system, such as a law or security, to be circumvented or otherwise avoided. Loopholes are searched for and used strategically in a variety of circumstances, including taxes, elections, politics, the criminal justice system, or in breaches of security. Historically, Arrow Slits were narrow vertical windows from which castle defenders launched arrows from a sheltered position. Arrow slits are also referred to as "loopholes." The Arrow slits were an important Castle part addition as a form of defence against intruders.

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