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Level 18 - CAIRTNEG
The answer to this puzzle is:
Words: REACTING, CATERING, ARGENTIC, TACRINE, CERATIN, GRATINE, CRATING, INGRATE, CIGARET, CARTING, ANERGIC, TANGIER, CREATIN, GAITER, CRETIN, INGATE, RECANT, CARNIE, EARING, REGAIN, REGINA, REAGIN, CARNET, TARING, GARNET, CANTER, TANREC, ENATIC, CERING, ARCING, AIGRET, CAGIER, RACING, GAINER, RATINE, ENGIRT, ACETIN, RETINA, GRATIN, RATING, INCAGE, CENTRA, CENTAI, CIGAR, GARNI, RECTA, TRICE, NACRE, REIGN, CITER, RANCE, TRIAC, TRINE, ANTIC, CAIRN, ACTIN, GRATE, CRATE, TENIA, ERICA, GENIC, INERT, CARTE, ENACT, NICER, CATER, TINEA, ACING, CERIA, AREIC, TERAI, NARIC, NIGER, REGNA, REACT, NITRE, RETAG, ENTIA, RIANT, CAGER, NITER, RANGE, RECIT, AGENT, TERGA, RETIA, CRANE, GREAT, ANGER, RENIG, TIGER, TRAIN, ANTRE, IRATE, TRAGI, GRANT, TINGE, GRAIN, GRACE, TRACE, CARET, TARGE, INTER, CANER, RECTI, GATER, GIANT, GNAR, CARN, TACE, NITE, CAIN, RANI, CIRE, GIEN, GAEN, AGIN, TARN, AIRN, GITE, GIRN, ETNA, GRAT, AGER, GIRT, GANE, AIRT, NARC, ETIC, TARE, GETA, TAIN, GRIT, TRIG, TIRE, GNAT, REIN, TING, RITE, RATE, TANG, NEAT, CARE, ACRE, TEAR, TIER, RACE, CENT, CANT, NEAR, RENT, RAIN, GEAR, ANTI, GAIN, EARN, CITE, RING, GATE, CRAG, RIGA, CAGE, ACNE, NICE, CANE, TERN, ANTE, CATE, CART, CRIT, RICE, CINE, TINE, GAIT, GRIN, GENT, IRAN, GRAN, RANG, RANT, RAGE, GIN, CAR, CAT, TEA, ETC, RAT, ERA, GET, ART, TAN, TIE, EAR, ANT, AGE, TIN, NET, ACE, ACT, GEN, GAT, ANI, GAR, CIG, REC, TEN, NIT, NAG, IRE, REG, ETA, RIG, ENG, EAT, RAG, TIC, GIT, ATE, ARC, TAR, RAN, ERG, ICE, ARE, TAG, AIR, CAN
Bonus words:
REACTING, CATERING, ARGENTIC, TACRINE, CERATIN, GRATINE, CRATING, INGRATE, CIGARET, CARTING, ANERGIC, TANGIER, CREATIN, GAITER, CRETIN, INGATE, RECANT, CARNIE, EARING, REGAIN, REGINA, REAGIN, CARNET, TARING, GARNET, CANTER, TANREC, ENATIC, CERING, ARCING, AIGRET, CAGIER, RACING, GAINER, RATINE, ENGIRT, ACETIN, RETINA, GRATIN, RATING, INCAGE, CENTRA, CENTAI, CIGAR, GARNI, RECTA, TRICE, NACRE, REIGN, CITER, RANCE, TRIAC, TRINE, ANTIC, CAIRN, ACTIN, GRATE, CRATE, TENIA, ERICA, GENIC, INERT, CARTE, ENACT, NICER, CATER, TINEA, ACING, CERIA, AREIC, TERAI, NARIC, NIGER, REGNA, REACT, NITRE, RETAG, ENTIA, RIANT, CAGER, NITER, RANGE, RECIT, AGENT, TERGA, RETIA, CRANE, GREAT, ANGER, RENIG, TIGER, TRAIN, ANTRE, IRATE, TRAGI, GRANT, TINGE, GRAIN, GRACE, TRACE, CARET, TARGE, INTER, CANER, RECTI, GATER, GIANT, GNAR, CARN, TACE, NITE, CAIN, RANI, CIRE, GIEN, GAEN, AGIN, TARN, AIRN, GITE, GIRN, ETNA, GRAT, AGER, GIRT, GANE, AIRT, NARC, ETIC, TARE, GETA, TAIN, GRIT, TRIG, TIRE, GNAT, REIN, TING, RITE, RATE, TANG, NEAT, CARE, ACRE, TEAR, TIER, RACE, CENT, CANT, NEAR, RENT, RAIN, GEAR, ANTI, GAIN, EARN, CITE, RING, GATE, CRAG, RIGA, CAGE, ACNE, NICE, CANE, TERN, ANTE, CATE, CART, CRIT, RICE, CINE, TINE, GAIT, GRIN, GENT, IRAN, GRAN, RANG, RANT, RAGE, GIN, CAR, CAT, TEA, ETC, RAT, ERA, GET, ART, TAN, TIE, EAR, ANT, AGE, TIN, NET, ACE, ACT, GEN, GAT, ANI, GAR, CIG, REC, TEN, NIT, NAG, IRE, REG, ETA, RIG, ENG, EAT, RAG, TIC, GIT, ATE, ARC, TAR, RAN, ERG, ICE, ARE, TAG, AIR, CAN