When {TAIL ~ the second number} of {HEAD ~ shock events} exceeds the upper event threshold, the shock threshold is increased 
When { TAIL ~ the second number } of { HEAD ~ shock events } exceeds the upper event threshold , the shock threshold is increased
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH