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Old English þus (inherited)
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Old English þȳs (cognate)
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Middle English thus (inherited)
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Middle English thous (mention)
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Middle English thos (mention)
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North Frisian - (cognate)
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North Frisian al doz (mention)
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West Frisian dus (cognate)
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Proto-West Germanic *þus (inherited)
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Low German sus (cognate)
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Old Saxon thius (cognate)