{HEAD ~ A device} to detect {TAIL ~ the location} of a plurality of magnets uses a plurality of magnetic sensors, having sensor elements arranged in a known fashion 
to detect
{ HEAD ~ A device } to detect { TAIL ~ the location } of a plurality of magnets uses a plurality of magnetic sensors , having sensor elements arranged in a known fashion
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH