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