build-index renders all 1,418 source characters and 34 target characters as 48x48 greyscale PNGs, one per font that natively contains the character. Fontconfig is queried per-character to avoid brute-force rendering across all 230 fonts (97% reduction: 8,881 targeted renders vs 326,140 brute-force).
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offers content optimization and creation tools that let you create SEO-friendly，这一点在搜狗输入法下载中也有详细论述
Managing the Allowlist