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Level 13 - IRNFGTA
The answer to this puzzle is:
Words: INGRAFT, FARTING, TARING, FARING, FATING, GRATIN, FAGIN, GRAFT, GARNI, AFRIT, RIANT, GRIFT, TRAGI, INFRA, FRAT, TING, RIGA, RANG, RANI, RANT, TANG, IRAN, TARN, TRIG, RAFT, FIAT, AIRN, ANTI, FIAR, FRAG, FART, AIRT, TAIN, FRIG, AGIN, FAIR, GNAT, FRIT, GAIT, RAIN, GIRN, GIRT, GIFT, GNAR, FIRN, GRAN, GRAT, GRIT, FAIN, GAIN, RAT, TAG, FAN, ART, TAN, AIR, FAR, ANT, AFT, TAR, RAN, NIT, NAG, GIT, GIN, GAT, GAR, FIR, FIN, FIG, FAG, ANI, RAG
Bonus words:
INGRAFT, FARTING, TARING, FARING, FATING, GRATIN, FAGIN, GRAFT, GARNI, AFRIT, RIANT, GRIFT, TRAGI, INFRA, FRAT, TING, RIGA, RANG, RANI, RANT, TANG, IRAN, TARN, TRIG, RAFT, FIAT, AIRN, ANTI, FIAR, FRAG, FART, AIRT, TAIN, FRIG, AGIN, FAIR, GNAT, FRIT, GAIT, RAIN, GIRN, GIRT, GIFT, GNAR, FIRN, GRAN, GRAT, GRIT, FAIN, GAIN, RAT, TAG, FAN, ART, TAN, AIR, FAR, ANT, AFT, TAR, RAN, NIT, NAG, GIT, GIN, GAT, GAR, FIR, FIN, FIG, FAG, ANI, RAG