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BIOFUEL
BIOMASS
COAL
ISOTOPES
KEROGEN
MAGMA
MELTDOWN
MINERAL
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RESOURCE
RESOURCES
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L | P | B | I | O | F | U | E | L |
A | M | A | G | M | A | C | H | C |
R | N | E | G | O | R | E | K | O |
E | N | A | T | U | R | A | L | A |
N | B | I | O | M | A | S | S | L |
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