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Level 4 - FRTAEWOS
The answer to this puzzle is:
Words: FRETSAW, FORESAW, TWOFERS, WAFTERS, WASTER, ORATES, AFTERS, TWOFER, WATERS, TOWERS, SOFTER, WAFTER, RAWEST, OSETRA, STRAFE, FORTES, TAWERS, WORSET, FROWST, OATERS, FETORS, WAFERS, AROSE, STREW, ROTAS, FATES, FRETS, FRATS, FEARS, SAWER, STRAW, SORTA, OFTER, ROSET, FEAST, RATOS, FORTE, RAFTS, WEFTS, SWORE, FARTS, FORTS, FEATS, SAFER, AFORE, WARES, SOWER, SWEAR, SWART, WREST, WAFTS, WEARS, FATSO, FARES, WARTS, FORES, SOFAR, OATER, SEWAR, STROW, RESOW, RESAT, RESAW, WORTS, TORAS, ROAST, SOFTA, TAWSE, TAWER, FROES, FETOR, TROWS, TAROS, FAROS, TOWER, TORSE, FETAS, WATER, ORATE, STOAE, WORSE, SWARF, ROTES, TARES, SWARE, TREWS, WASTE, SEROW, TOEAS, TWAES, TORES, SOWAR, SWOT, FROE, SATE, WERT, ROTS, TORS, ROTA, OARS, EROS, TSAR, SEAR, WEFT, WATS, FROW, ATES, WAFT, WETS, ETAS, FETS, AWES, WART, OAST, OAFS, ROES, TARS, SERF, ERST, TORA, SORA, TARE, TOWS, FRAE, EFTS, SETA, RATO, ARFS, FARO, FATS, WORE, ROWS, SORE, EATS, RATE, SOFT, ARTS, EAST, OWES, WARE, FORE, TORE, WOES, SWAT, AERO, REST, FEAT, FATE, FAST, SAFE, FORT, STAR, FARE, EARS, SORT, RATS, TEAR, WARS, FEST, WEAR, SOAR, RAFT, ERAS, FOES, TRES, STOW, TARO, FEAR, ARSE, SEAT, ROSE, ROTE, FRET, REFS, SERA, SOFA, FRAT, TWOS, WORT, ARES, FORA, TEAS, ORES, OATS, WEST, FART, FETA, STEW, TOES, FAT, SEA, EAT, TEA, FAR, WAR, FEW, SET, RAT, FOR, EAR, ERA, SAW, ART, SOW, OWE, AWE, OAR, OAF, FRO, ETA, SEW, FOE, AFT, WOE, FER, OAT, TWO, ROE, TOR, TOW, SER, WET, TOE, REF, WAS, RAW, SAT, ROW, ORE, ROT, RES, SOT, OFT, TAR, ATE, ARE
Bonus words:
FRETSAW, FORESAW, TWOFERS, WAFTERS, WASTER, ORATES, AFTERS, TWOFER, WATERS, TOWERS, SOFTER, WAFTER, RAWEST, OSETRA, STRAFE, FORTES, TAWERS, WORSET, FROWST, OATERS, FETORS, WAFERS, AROSE, STREW, ROTAS, FATES, FRETS, FRATS, FEARS, SAWER, STRAW, SORTA, OFTER, ROSET, FEAST, RATOS, FORTE, RAFTS, WEFTS, SWORE, FARTS, FORTS, FEATS, SAFER, AFORE, WARES, SOWER, SWEAR, SWART, WREST, WAFTS, WEARS, FATSO, FARES, WARTS, FORES, SOFAR, OATER, SEWAR, STROW, RESOW, RESAT, RESAW, WORTS, TORAS, ROAST, SOFTA, TAWSE, TAWER, FROES, FETOR, TROWS, TAROS, FAROS, TOWER, TORSE, FETAS, WATER, ORATE, STOAE, WORSE, SWARF, ROTES, TARES, SWARE, TREWS, WASTE, SEROW, TOEAS, TWAES, TORES, SOWAR, SWOT, FROE, SATE, WERT, ROTS, TORS, ROTA, OARS, EROS, TSAR, SEAR, WEFT, WATS, FROW, ATES, WAFT, WETS, ETAS, FETS, AWES, WART, OAST, OAFS, ROES, TARS, SERF, ERST, TORA, SORA, TARE, TOWS, FRAE, EFTS, SETA, RATO, ARFS, FARO, FATS, WORE, ROWS, SORE, EATS, RATE, SOFT, ARTS, EAST, OWES, WARE, FORE, TORE, WOES, SWAT, AERO, REST, FEAT, FATE, FAST, SAFE, FORT, STAR, FARE, EARS, SORT, RATS, TEAR, WARS, FEST, WEAR, SOAR, RAFT, ERAS, FOES, TRES, STOW, TARO, FEAR, ARSE, SEAT, ROSE, ROTE, FRET, REFS, SERA, SOFA, FRAT, TWOS, WORT, ARES, FORA, TEAS, ORES, OATS, WEST, FART, FETA, STEW, TOES, FAT, SEA, EAT, TEA, FAR, WAR, FEW, SET, RAT, FOR, EAR, ERA, SAW, ART, SOW, OWE, AWE, OAR, OAF, FRO, ETA, SEW, FOE, AFT, WOE, FER, OAT, TWO, ROE, TOR, TOW, SER, WET, TOE, REF, WAS, RAW, SAT, ROW, ORE, ROT, RES, SOT, OFT, TAR, ATE, ARE