Some keyword

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* UUID*
A Universally Unique Identifier (UUID) is a standardized 128-bit format for a string ID used to uniquely identify information. The point of a UUID is that it’s big enough that you can select any random and it won’t clash. In this case, it’s used to uniquely identify your application’s Bluetooth service. To get a UUID to use with your application, you can use one of the many random UUID generators on the web, then initialize a UUID with fromString(String).

撞脸的概率有多大呢?

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