{HEAD ~ The first segment} is rotatably coupled to {TAIL ~ the second segment} and the second segment is rotatably coupled to the third segment 
is rotatably coupled to
{ HEAD ~ The first segment } is rotatably coupled to { TAIL ~ the second segment } and the second segment is rotatably coupled to the third segment
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH