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In page Frisian languages:

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Frisian is the language most closely related to English and Scots[citation needed], but after at least five hundred years of being subject to the influence of Dutch, modern Frisian in some aspects bears a greater similarity to Dutch than to English; one must also take into account the centuries-long drift of English away from Frisian. Thus the two languages have become less mutually intelligible over time, partly due to the influence which Dutch and Low German have had on Frisian, and partly due to the vast influence some languages (in particular Norman French) have had on English throughout the centuries.