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