{HEAD ~ The central joint member} is also connected to {TAIL ~ another arm} having one end connected to a central joint member and its other end connected to a head joint member 
is connected to
{ HEAD ~ The central joint member } is also connected to { TAIL ~ another arm } having one end connected to a central joint member and its other end connected to a head joint member
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH 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