{HEAD ~ The other end} of lower arm 14 is connected to {TAIL ~ one part} 16a of a central joint 16 whose other part 16b is connected to one end of an upper arm 18 
is connected to
{ HEAD ~ The other end } of lower arm 14 is connected to { TAIL ~ one part } 16a of a central joint 16 whose other part 16b is connected to one end of an upper arm 18
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH