{TAIL ~ Sets} of {HEAD ~ symptom indicators} and extreme action indicators are also driven by the computer 
{ TAIL ~ Sets } of { HEAD ~ symptom indicators } and extreme action indicators are also driven by the computer
TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH