| http://www.w3.org/ns/prov#value | - It is appreciated that the period of time for which system 100 instructs shock detectors 120 and 122 to lower the intrusion thresholds thereof may be unlimited, and that system 100 may instruct shock detectors 120 and 122 to revert intrusion thresholds thereof to an earlier, higher, setting thereof in the future, for example in response to a future assessment of the probability of an intrusion occ
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