{TAIL ~ a terminal authorization certificate table} that stores the second terminal authorization certificate indicating access rights of the terminal for a network that is shared by a plurality of terminals including the terminal and the second terminal authorization certificate is used by each of {HEAD ~ the plurality} of terminals to determine access rights to the network 
{ TAIL ~ a terminal authorization certificate table } that stores the second terminal authorization certificate indicating access rights of the terminal for a network that is shared by a plurality of terminals including the terminal and the second terminal authorization certificate is used by each of { HEAD ~ the plurality } of terminals to determine access rights to the network
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