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