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Level 21 - OTERRUT
The answer to this puzzle is:
Words: RETORT, ROTTER, TURRET, TOUTER, TOURER, TRUER, TORTE, TOTER, ROTTE, OUTRE, UTTER, TROT, TOUT, TOTE, TORT, TORR, TORE, ROUT, ROTE, ORE, TOT, TOR, RUT, RUE, TUT, ROT, ROE, OUR, ERR
Bonus words:
RETORT, ROTTER, TURRET, TOUTER, TOURER, TRUER, TORTE, TOTER, ROTTE, OUTRE, UTTER, TROT, TOUT, TOTE, TORT, TORR, TORE, ROUT, ROTE, ORE, TOT, TOR, RUT, RUE, TUT, ROT, ROE, OUR, ERR