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Level 21 - MATSTSER
The answer to this puzzle is:
Words: SMARTEST, SMATTERS, TASTERS, SMATTER, STARETS, STATERS, STEAMS, MASERS, STATER, MATERS, TAMERS, ARMETS, ASTERS, TETRAS, SMEARS, TASTER, SMARTS, STARES, TASTES, TATERS, MATTES, TAMEST, MARSES, MATRES, RAMETS, TASSET, SETTS, TESTA, MASTS, TETRA, TRAMS, REAMS, SEARS, TRASS, RASES, TAMER, TRETS, SATEM, TARTS, MASSE, MATES, SEAMS, MARTS, TRESS, MASER, TARES, TATES, TASSE, SATES, STETS, ARSES, TATER, MATTS, EASTS, TSARS, MEATS, RESAT, RAMET, MARSE, ARMET, TEATS, TAMES, MESAS, RESTS, MARES, STEAM, STATS, TEARS, START, MATER, TEAMS, TESTS, TERMS, STEMS, TREAT, STARE, STATE, RATES, STARS, MATTE, TASTE, ASTER, ERST, TSAR, MATE, ARMS, EARS, MASS, TEAT, SAME, REAM, TRAM, TARE, TATS, TERM, RATE, ARTS, SETS, MAES, MESS, SETT, SETA, ATES, ETAS, TARS, STAR, STAT, STEM, TEAS, MEAT, EATS, RAMS, MATT, MAST, SEAT, TART, MART, MESA, TAME, SEAM, MARE, META, SATE, ERAS, RATS, SEAS, TEAM, TEAR, SEAR, ARES, EAST, TATE, MARS, REST, MATS, TEST, SERA, ARSE, TRES, EAR, ARM, RAT, ART, RAM, MAS, MET, EMS, RES, REM, SER, ATE, ETA, ATT, TEA, TAM, MAT, MAR, TAR, TAT, ASS, SAT, ARE, SET, EAT, ERA, SEA
Bonus words:
SMARTEST, SMATTERS, TASTERS, SMATTER, STARETS, STATERS, STEAMS, MASERS, STATER, MATERS, TAMERS, ARMETS, ASTERS, TETRAS, SMEARS, TASTER, SMARTS, STARES, TASTES, TATERS, MATTES, TAMEST, MARSES, MATRES, RAMETS, TASSET, SETTS, TESTA, MASTS, TETRA, TRAMS, REAMS, SEARS, TRASS, RASES, TAMER, TRETS, SATEM, TARTS, MASSE, MATES, SEAMS, MARTS, TRESS, MASER, TARES, TATES, TASSE, SATES, STETS, ARSES, TATER, MATTS, EASTS, TSARS, MEATS, RESAT, RAMET, MARSE, ARMET, TEATS, TAMES, MESAS, RESTS, MARES, STEAM, STATS, TEARS, START, MATER, TEAMS, TESTS, TERMS, STEMS, TREAT, STARE, STATE, RATES, STARS, MATTE, TASTE, ASTER, ERST, TSAR, MATE, ARMS, EARS, MASS, TEAT, SAME, REAM, TRAM, TARE, TATS, TERM, RATE, ARTS, SETS, MAES, MESS, SETT, SETA, ATES, ETAS, TARS, STAR, STAT, STEM, TEAS, MEAT, EATS, RAMS, MATT, MAST, SEAT, TART, MART, MESA, TAME, SEAM, MARE, META, SATE, ERAS, RATS, SEAS, TEAM, TEAR, SEAR, ARES, EAST, TATE, MARS, REST, MATS, TEST, SERA, ARSE, TRES, EAR, ARM, RAT, ART, RAM, MAS, MET, EMS, RES, REM, SER, ATE, ETA, ATT, TEA, TAM, MAT, MAR, TAR, TAT, ASS, SAT, ARE, SET, EAT, ERA, SEA