The 386 supports four privilege rings (0 through 3), though in practice nearly all operating systems use just two: ring 0 for the kernel and ring 3 for user programs. Three privilege levels interact on every segment access: CPL (Current Privilege Level), DPL (Descriptor Privilege Level), and RPL (Requested Privilege Level).
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Not Equal: Everything in this space must be different. The answer is 2-2, placed horizontally; 4-4, placed vertically; 0-0, placed vertically.，这一点在旺商聊官方下载中也有详细论述
"In hindsight, we should have provided more detail about our intentions and how the process works."，这一点在51吃瓜中也有详细论述