{HEAD ~ a planetary gear} that meshes with {TAIL ~ each} of the sun gear and the ring gear, and 
meshes with
{ HEAD ~ a planetary gear } that meshes with { TAIL ~ each } of the sun gear and the ring gear , and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH