growing {HEAD ~ the plurality} of carbon nanotubes from {TAIL ~ the at least one exposed portion} of the semiconductor substrate 
from
growing { HEAD ~ the plurality } of carbon nanotubes from { TAIL ~ the at least one exposed portion } of the semiconductor substrate
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH