If an area does not have any color coding, it means there are no conditions on the portions of dominoes within those spaces.
A pair like Cyrillic ԁ (U+0501) and Latin d scores 0.781 mean SSIM across 18 fonts. That sounds moderate. But it is pixel-identical (SSIM 1.000) in eight of those fonts: Arial, Menlo, Cochin, Tahoma, Charter, Georgia, Baskerville, and Verdana. An attacker needs only one font to succeed. The exploitable risk is the max, not the mean.
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Жители Санкт-Петербурга устроили «крысогон»17:52
Source: Computational Materials Science, Volume 266