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Level 15 - RIRTNIEO
The answer to this puzzle is:
Words: TONIER, NORITE, RIOTER, IRONER, TINIER, RETORN, TRIER, TRINE, TRONE, TORII, NOTER, NITER, NITRE, IRONE, TORR, NITE, TERN, ROTI, TIRO, NORI, INRO, INTI, TORI, ROTE, TORE, TRIO, RITE, TORN, TIER, NOIR, INTO, IRON, TINE, NOR, ONE, TON, TIE, NOT, TIN, NET, ION, EON, NIT, ERR, TEN, IRE, ROE, ORE, TOR, ROT, TOE
Bonus words:
TONIER, NORITE, RIOTER, IRONER, TINIER, RETORN, TRIER, TRINE, TRONE, TORII, NOTER, NITER, NITRE, IRONE, TORR, NITE, TERN, ROTI, TIRO, NORI, INRO, INTI, TORI, ROTE, TORE, TRIO, RITE, TORN, TIER, NOIR, INTO, IRON, TINE, NOR, ONE, TON, TIE, NOT, TIN, NET, ION, EON, NIT, ERR, TEN, IRE, ROE, ORE, TOR, ROT, TOE