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Level 1 - VTELRIAN
The answer to this puzzle is:
Words: LATRINE, RETINAL, VENTAIL, VENTRAL, TRENAIL, RATLINE, RAVELIN, TRINAL, LEARNT, RETIAL, LEVANT, NAILER, VAINER, TAILER, VARLET, VENIAL, LINTER, VALINE, ALINER, ALVINE, ALEVIN, RATLIN, TINEAL, NAIVER, VINEAL, TENAIL, VERNAL, RENAIL, RATINE, VEINAL, LARINE, LEANT, RAVEN, ANVIL, ALINE, TRAVE, LIVRE, INERT, TERAI, VELAR, RIVAL, LINER, TELIA, RIVEN, TINEA, LITER, LAVER, TENIA, LITRE, AVERT, TRINE, LEVIN, RAVEL, VITAE, INLET, LIANE, RAVIN, RENAL, ARIEL, VENAL, NAIVE, LIVEN, LATEN, RIANT, LEARN, RATEL, NAEVI, ENTIA, RETIA, LIVER, ELAIN, NITRE, ALIVE, NITER, ELINT, LATER, NAVEL, VILER, VALET, IRATE, RIVET, ANILE, AIVER, VITAL, NIVAL, ALERT, VIRAL, TRAIL, VINAL, INVAR, TILER, RELIT, TALER, TRIAL, ARTEL, INTER, ALIEN, ERVIL, ANTRE, ALTER, LAVE, VANE, ANIL, LARI, ELAN, TARN, TALI, RIAL, VELA, RANI, AIRN, VIER, RIEL, TELA, VINA, ETNA, LEVA, ARIL, ALIT, LATI, TARE, LIER, TAIN, VAIL, RIVE, LEAR, NEVI, RILE, VENA, AIRT, VIAL, VINE, VITA, TIER, LEAN, LIEN, LITE, TIRE, TEAR, NITE, RITE, RAIL, LIAR, TAIL, VAIN, EARL, VENT, RENT, RAIN, LATE, RATE, LINE, LIVE, TEAL, VALE, NAIL, REAL, NEAR, ANTI, TALE, EVIL, EARN, LANE, IRAN, REIN, NEAT, TILE, LIRE, VERT, VEIL, VERA, VILE, TINE, AVER, TERN, LIRA, VEAL, NAVE, LINT, ANTE, LAIN, LAIR, RAVE, VEIN, LENT, RANT, VIA, AVE, ART, ERA, NET, ANI, REV, AIL, ANT, EAR, TIE, TEA, VAN, TIN, TAN, EAT, ATE, LEI, RAT, VET, VAR, ALE, LIE, LAT, TIL, LIT, VIE, TEL, NIL, RAN, IRE, LIN, NIT, AIR, LET, TAR, ARE, VAT, ALT, ETA, TEN, LEA
Bonus words:
LATRINE, RETINAL, VENTAIL, VENTRAL, TRENAIL, RATLINE, RAVELIN, TRINAL, LEARNT, RETIAL, LEVANT, NAILER, VAINER, TAILER, VARLET, VENIAL, LINTER, VALINE, ALINER, ALVINE, ALEVIN, RATLIN, TINEAL, NAIVER, VINEAL, TENAIL, VERNAL, RENAIL, RATINE, VEINAL, LARINE, LEANT, RAVEN, ANVIL, ALINE, TRAVE, LIVRE, INERT, TERAI, VELAR, RIVAL, LINER, TELIA, RIVEN, TINEA, LITER, LAVER, TENIA, LITRE, AVERT, TRINE, LEVIN, RAVEL, VITAE, INLET, LIANE, RAVIN, RENAL, ARIEL, VENAL, NAIVE, LIVEN, LATEN, RIANT, LEARN, RATEL, NAEVI, ENTIA, RETIA, LIVER, ELAIN, NITRE, ALIVE, NITER, ELINT, LATER, NAVEL, VILER, VALET, IRATE, RIVET, ANILE, AIVER, VITAL, NIVAL, ALERT, VIRAL, TRAIL, VINAL, INVAR, TILER, RELIT, TALER, TRIAL, ARTEL, INTER, ALIEN, ERVIL, ANTRE, ALTER, LAVE, VANE, ANIL, LARI, ELAN, TARN, TALI, RIAL, VELA, RANI, AIRN, VIER, RIEL, TELA, VINA, ETNA, LEVA, ARIL, ALIT, LATI, TARE, LIER, TAIN, VAIL, RIVE, LEAR, NEVI, RILE, VENA, AIRT, VIAL, VINE, VITA, TIER, LEAN, LIEN, LITE, TIRE, TEAR, NITE, RITE, RAIL, LIAR, TAIL, VAIN, EARL, VENT, RENT, RAIN, LATE, RATE, LINE, LIVE, TEAL, VALE, NAIL, REAL, NEAR, ANTI, TALE, EVIL, EARN, LANE, IRAN, REIN, NEAT, TILE, LIRE, VERT, VEIL, VERA, VILE, TINE, AVER, TERN, LIRA, VEAL, NAVE, LINT, ANTE, LAIN, LAIR, RAVE, VEIN, LENT, RANT, VIA, AVE, ART, ERA, NET, ANI, REV, AIL, ANT, EAR, TIE, TEA, VAN, TIN, TAN, EAT, ATE, LEI, RAT, VET, VAR, ALE, LIE, LAT, TIL, LIT, VIE, TEL, NIL, RAN, IRE, LIN, NIT, AIR, LET, TAR, ARE, VAT, ALT, ETA, TEN, LEA