{HEAD ~ Each} of {TAIL ~ the mating surfaces} 121 has a portion formed with a positioning hole 13 
of
{ HEAD ~ Each } of { TAIL ~ the mating surfaces } 121 has a portion formed with a positioning hole 13
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH