{TAIL ~ The cranks} confine the motion of each of the transmission rings to {HEAD ~ a non rotary}, planetary motion 
{ TAIL ~ The cranks } confine the motion of each of the transmission rings to { HEAD ~ a non rotary } , planetary motion
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH