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Old English sīċ (inherited)
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Old English sīcan (inherited)
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English sitch (mention)
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English siche (doublet)
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English psych (mention)
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Middle English sike (inherited)
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Middle English siken (inherited)
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Proto-Germanic *sīką (inherited)
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Proto-West Germanic *sīkan (inherited)
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Norwegian sik (cognate)
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Old Norse sík (derived)