Training is a series of {TAIL ~ steps} in which 3 D image data and other 3 D data are combined into a 3 D model of {HEAD ~ a vehicle} being navigated 
Training is a series of { TAIL ~ steps } in which 3 D image data and other 3 D data are combined into a 3 D model of { HEAD ~ a vehicle } being navigated
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH