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