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Level 4 - ERAFIFG
The answer to this puzzle is:
Words: GAFFER, GRIFFE, AFIRE, GAFFE, FERIA, GRIFF, FIFER, GAFF, RIGA, RIFE, RIFF, FRIG, FIAR, FRAE, FIEF, AGER, FIFE, RAFF, IFF, AFF, RIG, FIR, REF, FIG, AIR, ARE, REG, IRE, ERG, FAG, FER, GAR, EFF, FIE
Bonus words:
GAFFER, GRIFFE, AFIRE, GAFFE, FERIA, GRIFF, FIFER, GAFF, RIGA, RIFE, RIFF, FRIG, FIAR, FRAE, FIEF, AGER, FIFE, RAFF, IFF, AFF, RIG, FIR, REF, FIG, AIR, ARE, REG, IRE, ERG, FAG, FER, GAR, EFF, FIE