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Level 20 - IRDUOTNA
The answer to this puzzle is:
Words: ROTUNDA, DIATRON, UNITARD, RAINOUT, AROINT, ROTUND, DIURON, RATION, OUTRAN, TURION, DURIAN, DURION, UNTROD, ORDAIN, ADROIT, INROAD, DINAR, NADIR, ANDRO, AUDIT, DAUNT, DANIO, RUTIN, DROIT, RIANT, TAUON, RANID, RADON, DOURA, AROID, NAIRU, TONDI, NORIA, TRONA, RATIO, TARDO, NOTA, DOUR, RANI, RUNT, TORI, IOTA, DITA, TARN, DONA, TRAD, ROUT, ROAN, TURD, DOIT, TROD, ROTA, DUIT, AIRN, DOAT, AIRT, DAUT, INRO, DUNT, DURN, DRAT, ADIT, UDON, NORI, RATO, TIRO, TORA, DINT, TAIN, ROTI, DURO, TARO, RIND, IRON, RAID, TURN, DIRT, DART, RUIN, TUNA, TORN, UNIT, DINO, UNDO, TOAD, IRAN, AUNT, ANTI, TRIO, RAIN, UNTO, TOUR, RIOT, DURA, RANT, DATO, ROAD, NOIR, DARN, AUTO, RAND, INTO, ARID, OUR, TIN, TAN, AIR, NOR, DON, ANT, RUN, OUT, RAT, NUT, ART, NOT, AID, TAR, TON, NOD, OAT, RUT, ANI, NIT, URN, TUN, TAD, ADO, OUD, TAU, DUN, DUO, ROT, RAD, RID, OAR, DIT, TOR, ION, DIN, RAN, ROD, DOT, AND
Bonus words:
ROTUNDA, DIATRON, UNITARD, RAINOUT, AROINT, ROTUND, DIURON, RATION, OUTRAN, TURION, DURIAN, DURION, UNTROD, ORDAIN, ADROIT, INROAD, DINAR, NADIR, ANDRO, AUDIT, DAUNT, DANIO, RUTIN, DROIT, RIANT, TAUON, RANID, RADON, DOURA, AROID, NAIRU, TONDI, NORIA, TRONA, RATIO, TARDO, NOTA, DOUR, RANI, RUNT, TORI, IOTA, DITA, TARN, DONA, TRAD, ROUT, ROAN, TURD, DOIT, TROD, ROTA, DUIT, AIRN, DOAT, AIRT, DAUT, INRO, DUNT, DURN, DRAT, ADIT, UDON, NORI, RATO, TIRO, TORA, DINT, TAIN, ROTI, DURO, TARO, RIND, IRON, RAID, TURN, DIRT, DART, RUIN, TUNA, TORN, UNIT, DINO, UNDO, TOAD, IRAN, AUNT, ANTI, TRIO, RAIN, UNTO, TOUR, RIOT, DURA, RANT, DATO, ROAD, NOIR, DARN, AUTO, RAND, INTO, ARID, OUR, TIN, TAN, AIR, NOR, DON, ANT, RUN, OUT, RAT, NUT, ART, NOT, AID, TAR, TON, NOD, OAT, RUT, ANI, NIT, URN, TUN, TAD, ADO, OUD, TAU, DUN, DUO, ROT, RAD, RID, OAR, DIT, TOR, ION, DIN, RAN, ROD, DOT, AND