The set of driven gears also comprises {HEAD ~ the gears} having {TAIL ~ different diameters} which rotate independently on an output shaft 
The set of driven gears also comprises { HEAD ~ the gears } having { TAIL ~ different diameters } which rotate independently on an output shaft
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH