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système de classement; système de représentation |
mapping system : 27 phrases in 12 subjects |
Coal | 1 |
Construction | 2 |
Earth sciences | 2 |
Food industry | 1 |
General | 1 |
Health care | 1 |
Life sciences | 2 |
Metallurgy | 2 |
Name of organization | 10 |
Nuclear physics | 1 |
Technology | 1 |
Water resources | 3 |