establishing {HEAD ~ the logical comparison} between {TAIL ~ the event times} registered by using a discrete event modelling and simulation method to thereby monitor and forecast customer traffic 
establishing { HEAD ~ the logical comparison } between { TAIL ~ the event times } registered by using a discrete event modelling and simulation method to thereby monitor and forecast customer traffic
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH