{TAIL ~ The present invention} improves upon {HEAD ~ the traditional system model} and paradigm by providing a security system with reliability exceeding that of existing wireless security systems, at lower cost than either professionally installed hardwired systems or wireless security systems 
{ TAIL ~ The present invention } improves upon { HEAD ~ the traditional system model } and paradigm by providing a security system with reliability exceeding that of existing wireless security systems , at lower cost than either professionally installed hardwired systems or wireless security systems
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