North poles in {HEAD ~ the first array} are aligned with south poles in {TAIL ~ the second array}, and south poles in the first array are aligned with north poles in the second array 
North poles in { HEAD ~ the first array } are aligned with south poles in { TAIL ~ the second array } , and south poles in the first array are aligned with north poles in the second array
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH