The two sets of {TAIL ~ two coils} are positioned on two different sides of {HEAD ~ the array} 
The two sets of { TAIL ~ two coils } are positioned on two different sides of { HEAD ~ the array }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD