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In page Verner's law:

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Karl Verner published his discovery in the article "Eine Ausnahme der ersten Lautverschiebung" (An exception to the first sound shift) in Kuhn's Journal of Comparative Linguistic Research in 1877,[1] but he had already presented his theory on 1 May 1875 in a comprehensive personal letter to his friend and mentor, Vilhelm Thomsen.[citation needed]