Thus, the second packet synchronizing signal e is free of {TAIL ~ an occurrence} of an unwanted pulse in {HEAD ~ the first packet synchronizing signal a} 
Thus , the second packet synchronizing signal e is free of { TAIL ~ an occurrence } of an unwanted pulse in { HEAD ~ the first packet synchronizing signal a }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD