{HEAD ~ The present invention} improves upon the traditional system model and {TAIL ~ 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 
improves upon
{ HEAD ~ The present invention } improves upon the traditional system model and { TAIL ~ 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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