At {HEAD ~ step S233}, the ignition switch is turned past {TAIL ~ ON} to START , for starting up engine E 
At { HEAD ~ step S233 } , the ignition switch is turned past { TAIL ~ ON } to START , for starting up engine E
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH