{HEAD ~ The sensor stack} includes {TAIL ~ a free layer} that is biased by direct exchange coupling with a layer of antiferromagnetic material  
includes
{ HEAD ~ The sensor stack } includes { TAIL ~ a free layer } that is biased by direct exchange coupling with a layer of antiferromagnetic material
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH