 a sense amplifier for comparing {TAIL ~ a resistance} in the MTJ cell in {HEAD ~ said first bit sub cell} with a resistance in the MTJ cell in said second bit sub cell 
a sense amplifier for comparing { TAIL ~ a resistance } in the MTJ cell in { HEAD ~ said first bit sub cell } with a resistance in the MTJ cell in said second bit sub cell
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH