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