said {HEAD ~ first timer} being adapted to periodically establish the commencement of a system on {TAIL ~ time}; and 
said { HEAD ~ first timer } being adapted to periodically establish the commencement of a system on { TAIL ~ time } ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH