{HEAD ~ Each one} of {TAIL ~ the drive gears} constantly meshes with its counterpart member of the driven gears 
of
{ HEAD ~ Each one } of { TAIL ~ the drive gears } constantly meshes with its counterpart member of the driven gears
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH