In {TAIL ~ writing}, {HEAD ~ the n transistors} in the read circuits form with two p transistors NOT circuits whose outputs form the data lines 
In { TAIL ~ writing } , { HEAD ~ the n transistors } in the read circuits form with two p transistors NOT circuits whose outputs form the data lines
REL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH