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Since the various braille alphabets originated as transcription codes for printed writing , the mappings ( sets of character designations ) vary from language to language , and even within one ; in English Braille there are three levels of encoding : Grade 1 – a letter-by-letter transcription used for basic literacy ; Grade 2 – an addition of abbreviations and contractions ; and Grade 3 – various non-standardized personal stenography .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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