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https://media.mstdn.io/mstdn-media/media_attachments/files/008/816/205/original/36977787165ef037.png
http://xahlee.info/comp/unicode_braille.html
when you have 6 dots, each is on/off, you have 2^6 = 64 possibilities.
when you have 8 dots, you have 2^8 = 256 possibilities.
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