Base 10 is connected to {HEAD ~ one part 12a} of {TAIL ~ a base} joint 12 
of
Base 10 is connected to { HEAD ~ one part 12a } of { TAIL ~ a base } joint 12
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH