Upon {HEAD ~ arrival} at the desired location and a given amount of {TAIL ~ time}, the encapsulated breaker can be released 
Upon { HEAD ~ arrival } at the desired location and a given amount of { TAIL ~ time } , the encapsulated breaker can be released
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH