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BIOFUEL
BIOMASS
COAL
ISOTOPES
KEROGEN
MAGMA
MELTDOWN
MINERAL
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RESOURCE
RESOURCES
S | Z | S | S | A | M | O | I | B |
K | E | R | O | G | E | N | O | L |
L | U | C | O | M | A | G | M | A |
A | I | T | R | L | Q | W | I | R |
O | L | A | R | U | T | A | N | E |
C | L | E | U | F | O | I | B | N |
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X | N | W | O | D | T | L | E | M |
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