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Level 15 - NRFEGOFI
The answer to this puzzle is:
Words: GRIFFON, REFFING, GOFFER, NIFFER, OFFING, FRINGE, GRIFFE, GONIFF, ERINGO, GRIFF, GONER, GOFER, FIFER, FEIGN, GIRON, IRONE, GONEF, GONIF, FOGIE, GENRO, FINER, RENIG, GIRO, ERGO, GOER, FINO, GIEN, FOIN, GIRN, FROE, INRO, FIRN, FIEF, FRIG, NORI, RIFE, GORE, FIRE, RING, FINE, FORE, NOIR, GONE, RIFF, REIN, IRON, FIFE, FERN, GRIN, ION, EGO, ORE, NOR, GIN, FOR, OFF, ENG, FIG, REF, FIR, ERG, FIE, IFF, EON, FOE, FEN, ONE, FER, NOG, ROE, EFF, FIN, RIG, REG, FOG, IRE, FRO, GEN
Bonus words:
GRIFFON, REFFING, GOFFER, NIFFER, OFFING, FRINGE, GRIFFE, GONIFF, ERINGO, GRIFF, GONER, GOFER, FIFER, FEIGN, GIRON, IRONE, GONEF, GONIF, FOGIE, GENRO, FINER, RENIG, GIRO, ERGO, GOER, FINO, GIEN, FOIN, GIRN, FROE, INRO, FIRN, FIEF, FRIG, NORI, RIFE, GORE, FIRE, RING, FINE, FORE, NOIR, GONE, RIFF, REIN, IRON, FIFE, FERN, GRIN, ION, EGO, ORE, NOR, GIN, FOR, OFF, ENG, FIG, REF, FIR, ERG, FIE, IFF, EON, FOE, FEN, ONE, FER, NOG, ROE, EFF, FIN, RIG, REG, FOG, IRE, FRO, GEN