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Level 3 - INGFRTA
The answer to this puzzle is:
Words: INGRAFT, FARTING, FATING, TARING, FARING, GRATIN, GRANT, AFRIT, RIANT, TRAGI, FAGIN, GRIFT, GARNI, GRAFT, FAINT, GRAIN, TRAIN, GIANT, ANTI, GNAT, RIGA, TRIG, IRAN, RANI, TARN, FAIN, TAIN, GRAT, FRIG, AGIN, GRIT, FRIT, GIRT, RING, FAIR, GNAR, FIAR, FIRN, AIRT, GIRN, AIRN, FRAT, FRAG, FART, GRIN, GRAN, TING, TANG, RANT, RANG, RAFT, FIAT, GAIN, RAIN, GAIT, FANG, ART, RAN, GIN, FAR, RAT, TAR, FIG, GIT, NIT, RAG, TAG, FAT, FIN, FIR, FAG, NAG, GAT, ANT, ANI, GAR, FIT, AIR, AFT, RIG
Bonus words:
INGRAFT, FARTING, FATING, TARING, FARING, GRATIN, GRANT, AFRIT, RIANT, TRAGI, FAGIN, GRIFT, GARNI, GRAFT, FAINT, GRAIN, TRAIN, GIANT, ANTI, GNAT, RIGA, TRIG, IRAN, RANI, TARN, FAIN, TAIN, GRAT, FRIG, AGIN, GRIT, FRIT, GIRT, RING, FAIR, GNAR, FIAR, FIRN, AIRT, GIRN, AIRN, FRAT, FRAG, FART, GRIN, GRAN, TING, TANG, RANT, RANG, RAFT, FIAT, GAIN, RAIN, GAIT, FANG, ART, RAN, GIN, FAR, RAT, TAR, FIG, GIT, NIT, RAG, TAG, FAT, FIN, FIR, FAG, NAG, GAT, ANT, ANI, GAR, FIT, AIR, AFT, RIG