The first driver circuit drives {HEAD ~ a first load element} formed of {TAIL ~ the first material} based on the first bias voltage 
The first driver circuit drives { HEAD ~ a first load element } formed of { TAIL ~ the first material } based on the first bias voltage
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH