{TAIL ~ Lugs} and relief areas formed on one face are staggered with respect to the lugs and {HEAD ~ relief areas} formed on the other face 
{ TAIL ~ Lugs } and relief areas formed on one face are staggered with respect to the lugs and { HEAD ~ relief areas } formed on the other face
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 OTH OTH OTH OTH OTH