The first and the second blocks are formed in {TAIL ~ a center area} of {HEAD ~ the tread surface} between the two third main grooves 
The first and the second blocks are formed in { TAIL ~ a center area } of { HEAD ~ the tread surface } between the two third main grooves
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH