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Level 12 - IEPTRNO
The answer to this puzzle is:
Words: TROPINE, PROTEI, TROPIN, TONIER, POINTE, PTERIN, NORITE, ORPINE, PERNIO, TRIPE, PRION, TRINE, OPINE, TENOR, TROPE, RIPEN, REPOT, REPIN, NOTER, NITER, NITRE, ORPIN, IRONE, NETOP, TOPER, TRONE, PITON, PINOT, POINT, ROPE, TERN, NITE, PERT, RENT, TORI, ROTE, PION, TINE, TROP, TIRE, PORT, REPO, ROTI, PEON, TOPE, TIRO, TOPI, NORI, OPEN, PERI, PENT, TRIP, NOTE, NOIR, PONE, RITE, PINE, NOPE, REIN, INTO, PIER, TORN, PORN, TIER, POET, IRON, INRO, TRIO, RIPE, PORE, PINT, TORE, RIOT, TONE, ONE, NET, PIN, POT, TOP, NOT, PER, TIN, TIE, PIE, EON, PIT, ROT, REP, TEN, PEN, ION, RIP, ORE, OPT, IRE, NIP, PET, ROE, PRO, NOR, TON, TOE, NIT, TOR, POI, TIP
Bonus words:
TROPINE, PROTEI, TROPIN, TONIER, POINTE, PTERIN, NORITE, ORPINE, PERNIO, TRIPE, PRION, TRINE, OPINE, TENOR, TROPE, RIPEN, REPOT, REPIN, NOTER, NITER, NITRE, ORPIN, IRONE, NETOP, TOPER, TRONE, PITON, PINOT, POINT, ROPE, TERN, NITE, PERT, RENT, TORI, ROTE, PION, TINE, TROP, TIRE, PORT, REPO, ROTI, PEON, TOPE, TIRO, TOPI, NORI, OPEN, PERI, PENT, TRIP, NOTE, NOIR, PONE, RITE, PINE, NOPE, REIN, INTO, PIER, TORN, PORN, TIER, POET, IRON, INRO, TRIO, RIPE, PORE, PINT, TORE, RIOT, TONE, ONE, NET, PIN, POT, TOP, NOT, PER, TIN, TIE, PIE, EON, PIT, ROT, REP, TEN, PEN, ION, RIP, ORE, OPT, IRE, NIP, PET, ROE, PRO, NOR, TON, TOE, NIT, TOR, POI, TIP