drawing a carbon nanotube film from {HEAD ~ a carbon nanotube array} along {TAIL ~ a first direction} 
drawing a carbon nanotube film from { HEAD ~ a carbon nanotube array } along { TAIL ~ a first direction }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL