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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
47G · building activities
47G2 · laying the foundations; trench
47G23 · earth moving techniques (~ building activities)
47G23(+0) · earth moving techniques (~ building activities) (+ variant)