Insulation
insulation
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COLD
ENERGY
FIRE
HEAT
HOT
INSULATOR
STOVE
SUN
TRANSFER
| F | I | R | E | R | R | P | N | I |
| Z | B | K | J | X | L | F | N | T |
| U | N | E | V | O | T | S | S | R |
| F | U | W | F | J | U | L | U | A |
| U | R | A | M | L | K | G | I | N |
| U | D | H | A | U | H | T | X | S |
| C | L | T | P | Y | T | A | C | F |
| C | O | Q | Y | G | R | E | N | E |
| R | C | L | H | T | O | H | V | R |
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