The transistor has {HEAD ~ at least one semiconducting carbon nanotube} that is electrically coupled between {TAIL ~ the source and drain electrodes} 
is electrically coupled between
The transistor has { HEAD ~ at least one semiconducting carbon nanotube } that is electrically coupled between { TAIL ~ the source and drain electrodes }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL