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Related Clues:
- Greenhouse gas
- Element used in dating rocks
- Swamp gas, essentially
- Firedamp, for the most part
- Diamond, essentially
- Chemical element occurring as diamond
- Chemical element occurring in pure form in diamond
- Chemical element as in diamond
- This paper is used to make copies
- This copy is exact
- Charcoal is a form of this element
- Abundant chemical element, symbol C
- Dioxide or monoxide, say
- Chemical element occurring in pure form in diamonds and graphite
- Element in diamonds and graphite