When the first error check routine is completed, {HEAD ~ the correction controller} 105 performs {TAIL ~ a second error check routine} or an error verification routine  
performs
When the first error check routine is completed , { HEAD ~ the correction controller } 105 performs { TAIL ~ a second error check routine } or an error verification routine
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH