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- Linguistic change (5)
- English language--Grammar, Comparative--German (1)
- German language (1)
- German language--Grammar, Comparative--English (1)
- Grammar, Comparative and general--Morphology (1)
- Language and languages--Etymology (1)
- Language planning (1)
- Linguistics--History--19th century (1)
- Neogrammarians (1)
- Semantics, Historical (1)
- Standard language (1)