Thus, {HEAD ~ the abnormal state detection circuit} 23 outputs {TAIL ~ a high level} until both signals agree with each other 
outputs
Thus , { HEAD ~ the abnormal state detection circuit } 23 outputs { TAIL ~ a high level } until both signals agree with each other
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH