{TAIL ~ The signal lamps} 3 for a swimmer is equipped at a starting block 4 which is provided at {HEAD ~ the starting side} of a swimming pool 1 so as to project at the front of the starting block 4 
{ TAIL ~ The signal lamps } 3 for a swimmer is equipped at a starting block 4 which is provided at { HEAD ~ the starting side } of a swimming pool 1 so as to project at the front of the starting block 4
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH