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BIOFUEL
BIOMASS
ISOTOPES
KEROGEN
MAGMA
MANTLE
MELTDOWN
MINERAL
NATURAL
REMOVAL
RESOURCE
RESOURCES
| S | B | I | O | M | A | S | S | M |
| X | E | X | K | P | L | E | N | J |
| L | M | C | E | Z | E | P | W | L |
| A | A | A | R | M | U | O | O | A |
| R | N | M | O | U | F | T | D | V |
| U | T | G | G | C | O | O | T | O |
| T | L | A | E | N | I | S | L | M |
| A | E | M | N | E | B | I | E | E |
| N | L | A | R | E | N | I | M | R |
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