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