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