Number (4): Everything in this space must add up to 4. The answer is 4-0, placed horizontally.
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。safew官方下载对此有专业解读
block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.，这一点在服务器推荐中也有详细论述
But that’s a lot of resetting! We can save a bunch of bandwidth by instead tracking the current foreground and background color in our renderer and only emitting a new color escape sequence when our desired color changes. This is an annoying amount of bookkeeping but it substantially cuts down on the amount of escape codes emitted.