{HEAD ~ The sync mark detector} correlates {TAIL ~ the detected bit sequence} with a target sync mark and outputs a sync mark detected signal when the sync mark is found 
correlates
{ HEAD ~ The sync mark detector } correlates { TAIL ~ the detected bit sequence } with a target sync mark and outputs a sync mark detected signal when the sync mark is found
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH