Equal (5): Everything in this purple space must be equal to 5. The answer is 5-5, placed horizontally; 5-6, placed vertically.
Phosphate is a stencil-style font where many characters reduce to simple geometric forms. Copperplate is all-caps, eliminating case-based distinctions between scripts. These are the fonts where confusable pairs converge.，这一点在一键获取谷歌浏览器下载中也有详细论述
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Source: Computational Materials Science, Volume 267。快连下载安装对此有专业解读