removing at least one portion of {HEAD ~ the plurality} of {TAIL ~ carbon nanotubes} to expose at least one portion of the semiconductor substrate within the plurality of carbon nanotubes 
removing at least one portion of { HEAD ~ the plurality } of { TAIL ~ carbon nanotubes } to expose at least one portion of the semiconductor substrate within the plurality of carbon nanotubes
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH