{HEAD ~ The projectors} and the cameras may be electronically connected to {TAIL ~ a computer processor} which controls their operation 
{ HEAD ~ The projectors } and the cameras may be electronically connected to { TAIL ~ a computer processor } which controls their operation
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH