Synchronization may be facilitated by receipt of a reference time event such that {HEAD ~ a clock} is synchronized based on {TAIL ~ the reference time event} 
is synchronized based on
Synchronization may be facilitated by receipt of a reference time event such that { HEAD ~ a clock } is synchronized based on { TAIL ~ the reference time event }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL