Thus, {TAIL ~ the wheels} 23 are faced with the slope 311, and {HEAD ~ the propped surfaces} 312, 313 
Thus , { TAIL ~ the wheels } 23 are faced with the slope 311 , and { HEAD ~ the propped surfaces } 312 , 313
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH