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Old English spearca (inherited)
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Middle English sparke (inherited)
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Middle English sperke (mention)
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Middle Low German sparke (cognate)
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Proto-Indo-European *sperg- (derived)
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Dutch spark (cognate)
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Old Norse sparkr (cognate)
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English spunk (blend)
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Esperanto sparko (mention)
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Saterland Frisian Spoorke (link)