k--; // 剩余删除名额减1（关键：控制删除位数，保证保留足够长度）
On top of that, we can get two full pixels of color using foreground and background colors. If we render an upper block with a foreground color of cyan and a background color of red, we get a cyan pixel sitting on top of a red pixel!。关于这个话题，爱思助手下载最新版本提供了深入分析
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1960s-1970s ATMs so primitive was the lack of computer systems that were
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