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Level 18 - ONFRRETI
The answer to this puzzle is:
Words: ROTIFER, FRONTER, REFRONT, TONIER, NORITE, RIOTER, FORINT, RETORN, IRONER, FORRIT, TRONE, OFTER, RIFER, TRINE, NITRE, FRIER, FIRER, REFIT, TRIER, NOTER, FRORE, FEINT, FINER, FETOR, NITER, IRONE, FIRE, TERN, FINO, RIFE, FIRN, FRET, ROTE, TORI, NORI, NITE, NOTE, FERN, ROTI, TORR, FROE, IRON, TIRO, FRIT, FORT, INFO, RIOT, INTO, TIRE, TIER, TORN, RITE, REIN, RIFT, TORE, TINE, INRO, FONT, NOIR, FOIN, FORE, RENT, TRIO, TOR, TON, FIT, REF, TOE, ION, ORE, NOR, NET, TIE, ONE, TIN, FOR, NOT, OFT, ROT, FEN, TEN, FER, EON, FIE, ERR, FOE, FIR, FIN, FRO, IRE, NIT, ROE
Bonus words:
ROTIFER, FRONTER, REFRONT, TONIER, NORITE, RIOTER, FORINT, RETORN, IRONER, FORRIT, TRONE, OFTER, RIFER, TRINE, NITRE, FRIER, FIRER, REFIT, TRIER, NOTER, FRORE, FEINT, FINER, FETOR, NITER, IRONE, FIRE, TERN, FINO, RIFE, FIRN, FRET, ROTE, TORI, NORI, NITE, NOTE, FERN, ROTI, TORR, FROE, IRON, TIRO, FRIT, FORT, INFO, RIOT, INTO, TIRE, TIER, TORN, RITE, REIN, RIFT, TORE, TINE, INRO, FONT, NOIR, FOIN, FORE, RENT, TRIO, TOR, TON, FIT, REF, TOE, ION, ORE, NOR, NET, TIE, ONE, TIN, FOR, NOT, OFT, ROT, FEN, TEN, FER, EON, FIE, ERR, FOE, FIR, FIN, FRO, IRE, NIT, ROE