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BIOFUEL
BIOMASS
COAL
ISOTOPES
MAGMA
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MINERAL
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| S | B | I | O | M | A | S | S | H |
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| L | L | C | O | A | L | P | W | L |
| E | A | A | R | K | O | O | O | A |
| U | L | R | R | U | H | T | D | V |
| F | K | T | U | E | O | O | T | O |
| O | L | Y | N | T | N | S | L | M |
| I | Y | M | I | A | A | I | E | E |
| B | A | M | G | A | M | N | M | R |
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