{HEAD ~ The device} includes a pair of {TAIL ~ toroid magnets} each having a north pole and a south pole 
{ HEAD ~ The device } includes a pair of { TAIL ~ toroid magnets } each having a north pole and a south pole
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH