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| main constituent | |||
| major constituent; major component | |||
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| principal component | |||
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| principal components | |||
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composant principal : 7 phrases, 7 sujets |
| Charbon | 1 |
| Environnement | 1 |
| Mathématiques | 1 |
| Nom de l'organisation | 1 |
| Pharmacie et pharmacologie | 1 |
| Physique nucléaire | 1 |
| Statistiques | 1 |