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