| http://www.w3.org/ns/prov#value | - Returning to step 1314, if the event is a signal from the third node 130 (DHA), event 1319, then in step 1320, the TA is operated to validate the optional sequence number in the signal by ensuring it is not less than a previous received sequence number, and/or that it matches a sequence number previously transmitted to the third node 130 by the second node 120.
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