{TAIL ~ The system} comprises a plurality of magnetic sensors, each of which is oriented in a known direction and generates a set of signals as a function of the static magnetic field strength and direction due to {HEAD ~ each} of the plurality of magnets 
{ TAIL ~ The system } comprises a plurality of magnetic sensors , each of which is oriented in a known direction and generates a set of signals as a function of the static magnetic field strength and direction due to { HEAD ~ each } of the plurality of magnets
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