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 each of {HEAD ~ the plurality} of {TAIL ~ magnets} 
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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 each of { HEAD ~ the plurality } of { TAIL ~ magnets }
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