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Level 1 - CTFAIRF
The answer to this puzzle is:
Words: FRACTI, TRIAC, FARCI, AFRIT, RAFF, CRIT, CAFF, FRIT, FIAR, FRAT, AIRT, RIFF, TIFF, ACT, FAT, FAR, ART, CAT, RAT, AIR, ARC, AFT, CAR, FIR, AFF, IFF, TIC
Bonus words:
FRACTI, TRIAC, FARCI, AFRIT, RAFF, CRIT, CAFF, FRIT, FIAR, FRAT, AIRT, RIFF, TIFF, ACT, FAT, FAR, ART, CAT, RAT, AIR, ARC, AFT, CAR, FIR, AFF, IFF, TIC