When {HEAD ~ the timer} has expired at {TAIL ~ step} 325, a second recovery function is selected at step 330 that will be performed if a fault occurs 
expired at
When { HEAD ~ the timer } has expired at { TAIL ~ step } 325 , a second recovery function is selected at step 330 that will be performed if a fault occurs
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH