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Level 13 - TNEGILAR
The answer to this puzzle is:
Words: RELATING, ALTERING, TANGLIER, ALERTING, RETINAL, RATLINE, ELATING, TANGLER, TINGLER, NARGILE, REGINAL, GRATINE, TAGLINE, RINGLET, GELATIN, REALIGN, ATINGLE, TRENAIL, LATRINE, ENGRAIL, INGRATE, TANGIER, ALIGNER, LEARNT, INGATE, TINGLE, GARNET, RETAIN, ALINER, REGNAL, LINTER, NAILER, REAGIN, GAINER, GENIAL, EARING, LINGER, ANGLER, GELATI, REGAIN, GRATIN, GENTIL, LINAGE, TAILER, REGINA, RETIAL, GAITER, TARING, TENAIL, LIGATE, ENGIRT, RENAIL, GLAIRE, AIGRET, TERGAL, LARINE, GELANT, RATINE, REGILT, AIGLET, TINEAL, TRINAL, RATLIN, EATING, RATING, LEARN, LEANT, RENAL, GLARE, LINGA, TELIA, LARGE, AGENT, NITER, LEGIT, RANGE, LIGER, RETIA, INLET, AGILE, LAGER, INGLE, GLAIR, LITRE, GLEAN, TRAIN, TIGER, ALINE, TENIA, TINGE, TRINE, LIANG, ANGER, GRATE, GARNI, GLINT, LIANE, RENIG, ALERT, GRAIL, INERT, ARIEL, REGAL, GREAT, TINEA, LATEN, AGLET, TERAI, ANGLE, IRATE, ANTRE, TILER, ALIGN, ANILE, REGNA, ARGIL, TRIAL, ELAIN, ALGIN, ALIEN, ELINT, ALTER, NIGER, INTER, TRAIL, NITRE, RETAG, GRANT, ENTIA, RIANT, RATEL, GIANT, TRAGI, GRAIN, GNARL, ANGEL, RELIT, ARTEL, LITER, TALER, GATER, REIGN, LIGAN, LINER, ARGLE, TARGE, LATER, TERGA, TAIN, LATI, GIRT, LARI, GIRN, GANE, LEAR, RILE, ELAN, ARIL, LIER, GRAT, TARE, GIEN, GAEN, AGER, EGAL, AIRT, GITE, GETA, GELT, AIRN, ALIT, GLIA, ETNA, RIEL, TELA, RIAL, GNAR, AGIN, GAIT, TALI, RITE, LANG, EARL, NEAR, TANG, REAL, TAIL, LINE, NEAT, RAIL, LIAR, TING, REIN, TILE, LING, GILT, TARN, RING, GRIN, LITE, GAIN, ANTI, TALE, GEAR, RAIN, RENT, TIRE, GNAT, LIEN, RIGA, LEAN, IRAN, LANE, TIER, TEAR, GATE, RATE, EARN, TEAL, ANIL, RANI, NITE, LIRA, TRIG, TERN, ANTE, LINT, NAIL, GRIT, LATE, LIRE, LAIR, TINE, GENT, RANT, RAGE, GIRL, GLEN, GRAN, RANG, LENT, GALE, LAIN, AIR, ART, TEA, LEG, GIN, TIN, LET, TIE, EAR, ANT, TAN, EAT, AGE, RAT, GET, ERA, NET, ALE, TAG, ETA, ERG, LEI, GAT, ANI, GAR, AIL, LEA, NIT, LIN, NAG, IRE, LAT, NIL, REG, RIG, ARE, TEL, LIE, GEL, TIL, LIT, RAN, TAR, ALT, GEN, GAL, LAG, ATE, GIT, RAG, ENG, TEN
Bonus words:
RELATING, ALTERING, TANGLIER, ALERTING, RETINAL, RATLINE, ELATING, TANGLER, TINGLER, NARGILE, REGINAL, GRATINE, TAGLINE, RINGLET, GELATIN, REALIGN, ATINGLE, TRENAIL, LATRINE, ENGRAIL, INGRATE, TANGIER, ALIGNER, LEARNT, INGATE, TINGLE, GARNET, RETAIN, ALINER, REGNAL, LINTER, NAILER, REAGIN, GAINER, GENIAL, EARING, LINGER, ANGLER, GELATI, REGAIN, GRATIN, GENTIL, LINAGE, TAILER, REGINA, RETIAL, GAITER, TARING, TENAIL, LIGATE, ENGIRT, RENAIL, GLAIRE, AIGRET, TERGAL, LARINE, GELANT, RATINE, REGILT, AIGLET, TINEAL, TRINAL, RATLIN, EATING, RATING, LEARN, LEANT, RENAL, GLARE, LINGA, TELIA, LARGE, AGENT, NITER, LEGIT, RANGE, LIGER, RETIA, INLET, AGILE, LAGER, INGLE, GLAIR, LITRE, GLEAN, TRAIN, TIGER, ALINE, TENIA, TINGE, TRINE, LIANG, ANGER, GRATE, GARNI, GLINT, LIANE, RENIG, ALERT, GRAIL, INERT, ARIEL, REGAL, GREAT, TINEA, LATEN, AGLET, TERAI, ANGLE, IRATE, ANTRE, TILER, ALIGN, ANILE, REGNA, ARGIL, TRIAL, ELAIN, ALGIN, ALIEN, ELINT, ALTER, NIGER, INTER, TRAIL, NITRE, RETAG, GRANT, ENTIA, RIANT, RATEL, GIANT, TRAGI, GRAIN, GNARL, ANGEL, RELIT, ARTEL, LITER, TALER, GATER, REIGN, LIGAN, LINER, ARGLE, TARGE, LATER, TERGA, TAIN, LATI, GIRT, LARI, GIRN, GANE, LEAR, RILE, ELAN, ARIL, LIER, GRAT, TARE, GIEN, GAEN, AGER, EGAL, AIRT, GITE, GETA, GELT, AIRN, ALIT, GLIA, ETNA, RIEL, TELA, RIAL, GNAR, AGIN, GAIT, TALI, RITE, LANG, EARL, NEAR, TANG, REAL, TAIL, LINE, NEAT, RAIL, LIAR, TING, REIN, TILE, LING, GILT, TARN, RING, GRIN, LITE, GAIN, ANTI, TALE, GEAR, RAIN, RENT, TIRE, GNAT, LIEN, RIGA, LEAN, IRAN, LANE, TIER, TEAR, GATE, RATE, EARN, TEAL, ANIL, RANI, NITE, LIRA, TRIG, TERN, ANTE, LINT, NAIL, GRIT, LATE, LIRE, LAIR, TINE, GENT, RANT, RAGE, GIRL, GLEN, GRAN, RANG, LENT, GALE, LAIN, AIR, ART, TEA, LEG, GIN, TIN, LET, TIE, EAR, ANT, TAN, EAT, AGE, RAT, GET, ERA, NET, ALE, TAG, ETA, ERG, LEI, GAT, ANI, GAR, AIL, LEA, NIT, LIN, NAG, IRE, LAT, NIL, REG, RIG, ARE, TEL, LIE, GEL, TIL, LIT, RAN, TAR, ALT, GEN, GAL, LAG, ATE, GIT, RAG, ENG, TEN