{HEAD ~ The control system} is adapted to receive remote ledger information from the remote communications unit relating to the independent ledger, compare corresponding information on the shadow ledger with the remote ledger information, and update the shadow ledger if the information is different from the information of {TAIL ~ the independent ledger} 
{ HEAD ~ The control system } is adapted to receive remote ledger information from the remote communications unit relating to the independent ledger , compare corresponding information on the shadow ledger with the remote ledger information , and update the shadow ledger if the information is different from the information of { TAIL ~ the independent ledger }
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