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In page Old Norse:

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Tracing the origins of words like "bull" and "Thursday" is more difficult.[citation needed] "Bull" may derive from either Old English bula or Old Norse buli,[citation needed] while "Thursday" may be a borrowing or simply derive from the Old English Þunresdæg, which could have been influenced by the Old Norse cognate.[citation needed] The word "are" is from Old English earun/aron, which stems back to Proto-Germanic as well as the Old Norse cognates.[citation needed]