copyright dates they must have been around by 1977.
Two characters might have identical Unicode skeletons but render differently in specific fonts, or have different skeletons but render identically in a particular typeface. Detecting this requires rendering glyphs and comparing pixel output. No purely Unicode-data-based approach handles it, and UTS #39 does not attempt to.。关于这个话题，下载安装 谷歌浏览器 开启极速安全的 上网之旅。提供了深入分析
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