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Old English sīþþan (inherited)
←
Old English sīþ (mention)
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Old English þǣm (mention)
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Old English þæt (mention)
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Middle English syns (inherited)
←
Middle English sinnes (mention)
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Middle English sithen (mention)
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Middle English -s (mention)
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Westrobothnian ätter (link)
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Luxembourgish zanter (mention)
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Norwegian Bokmål siden (cognate)
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Norwegian Bokmål siden (link)