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1 · Religion and Magic
2 · Nature
3 · Human Being, Man in General
4 · Society, Civilization, Culture
5 · Abstract Ideas and Concepts
6 · History
7 · Bible
8 · Literature
9 · Classical Mythology and Ancient History
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4 · Society, Civilization, Culture
47 · crafts and industries
47C · industrial processes, handling of materials
47C1 · preparing, cleaning, sorting, selecting (industrial processes, handling of materials)
47C13 · cleaning of material
47C13(+0) · cleaning of material (+ variant)