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They use braille
Braille is an arrangement of raised dots on a surface that form numbers, letters, and words. Blind persons feel the dots with their fingertips to recognize the patterns.
The technique is similar to holding a pair of dice in your hand and feeling the dents that tell you what number is on each face. You can feel how many dents there are, which tells you what number it is. Braille is the same except the letters are raised bumps. Each set of raised bumps is a different letter. Just like the dice. People that read Braille learn what each letter feels like. Both hands are used in reading Braille, but mainly the index fingers.
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