There are also some questions around safety.
2. 分区：小于pivot的放左边，大于的放右边
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I have another layer with the FN keys and a bunch of macros to send characters that don't have their own keycodes, like em dash and en dash and bullets. I have Unicode macros on one side of the keyboard—for Linux and chromeOS—and alt-code macros mirrored on the other half of the keyboard for Windows.
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