Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
It started with a flash of insight like a thunderbolt in a snow storm, the sort of insight that can only be induced by high altitude hypoxia and making breakfast.
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Keys that have a warning icon, meaning they are set to unrestricted
With additional reporting from Mark Poynting, Jonah Fisher, Miho Tanaka and Tom Ingham.
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