{HEAD ~ The selection} of {TAIL ~ timing masters} is based on the synchronization signals received from one or more of the timing servers of the multiple pluralities of timing servers and on a relationship among the unique constants stored in each timing server 
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{ HEAD ~ The selection } of { TAIL ~ timing masters } is based on the synchronization signals received from one or more of the timing servers of the multiple pluralities of timing servers and on a relationship among the unique constants stored in each timing server
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH