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