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Old English rīxian (inherited)
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Middle English rixen (inherited)
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Middle High German richsen (cognate)
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Proto-West Germanic *rīkisōn (inherited)
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Proto-Indo-European *h₃reǵ- (root)
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Proto-Indo-European *h₃reǵ- (derived)
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Lithuanian rikis (cognate)
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Middle English riken (link)