Thus, not only does the data identify whether a selected event occurred, but {TAIL ~ the data} also indicates an exact sequence of {HEAD ~ the order} that the events occurred 
Thus , not only does the data identify whether a selected event occurred , but { TAIL ~ the data } also indicates an exact sequence of { HEAD ~ the order } that the events occurred
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH