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