In particular, a counter mechanism is utilized, whereas the counter mechanism is incremented or decremented based on {HEAD ~ the occurrence} of {TAIL ~ particular events} 
In particular , a counter mechanism is utilized , whereas the counter mechanism is incremented or decremented based on { HEAD ~ the occurrence } of { TAIL ~ particular events }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL