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Polymath 347

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ralphwalker | 04:34 Mon 05th Jun 2006 | Quizzes & Puzzles
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7d Graphite formed on the surface of molten iron with a high carbon content. I have K?S?. It should be obvious, I know. I have been right through Chambers but can find nothing.

Can someone out there please help? From sunny Singapore
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kish
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Thank you very much, Kerry 152

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Polymath 347

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