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Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
。服务器推荐是该领域的重要参考
You know exactly what type of problem I'm talking about. Making your own programming language. An IDE that supports structural editing. More and more advanced static type checkers. Custom build systems. I'm sure you can think of others.
Andrew uses only 39 keys on each of his keyboards