wherein {HEAD ~ the set} of {TAIL ~ magnetic poles} and the gap are arranged near a recording surface of a magnetic recording medium, 
wherein { HEAD ~ the set } of { TAIL ~ magnetic poles } and the gap are arranged near a recording surface of a magnetic recording medium ,
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH