{HEAD ~ A timing system} for swimming race which records, displays, and prints the time of {TAIL ~ race} 
{ HEAD ~ A timing system } for swimming race which records , displays , and prints the time of { TAIL ~ race }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL