Further, a visual display device is provided in order that {TAIL ~ a swimmer} can recognize {HEAD ~ a starting signal} visually 
Further , a visual display device is provided in order that { TAIL ~ a swimmer } can recognize { HEAD ~ a starting signal } visually
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH