{TAIL ~ The arrays} of {HEAD ~ permanent magnets} each has north and south poles distributed in both longitudinal and latitudinal directions along a plane 
{ TAIL ~ The arrays } of { HEAD ~ permanent magnets } each has north and south poles distributed in both longitudinal and latitudinal directions along a plane
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH