{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 {TAIL ~ the remote ledger information}, and update the shadow ledger if the information is different from the information of 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 { TAIL ~ the remote ledger information } , and update the shadow ledger if the information is different from the information of the independent ledger
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