Therefore a swimmer can see {TAIL ~ the display} of {HEAD ~ the signal lamps} 3 while standing on the starting block 4 
Therefore a swimmer can see { TAIL ~ the display } of { HEAD ~ the signal lamps } 3 while standing on the starting block 4
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH