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- bilingualism (1)
- history (1)
- language and languages (1)
- linguistics (1)
- mathematics (1)
- mathematics, medieval (1)
- multilingualism (1)
- numeration (1)
- religion and science (1)
- science, renaissance (1)
- signs and symbols (1)
- sociolinguistics (1)
- 手势语 (1)
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