{TAIL ~ The first main groove} is made of {HEAD ~ a see through groove} extending in the tire circumferential direction 
{ TAIL ~ The first main groove } is made of { HEAD ~ a see through groove } extending in the tire circumferential direction
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH