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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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2 · Nature
22 · natural phenomena
22B · electricity and magnetism
22B1 · electrical phenomena
22B2 · magnetic phenomena