FIG 3 shows the arm 12 in {TAIL ~ an intermediate position} in which {HEAD ~ the lengths} of the two cords 57 are identical 
in
FIG 3 shows the arm 12 in { TAIL ~ an intermediate position } in which { HEAD ~ the lengths } of the two cords 57 are identical
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH