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