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Level 13 - RSETQEU
The answer to this puzzle is:
Words: QUESTER, RETUSE, QUEERS, STERE, TRUES, REEST, TERSE, ESTER, SUET, REES, SERE, ERST, RETE, TREE, RUTS, TEES, UTES, TRES, RUSE, SEER, RUES, SUE, SET, SER, TEE, USE, RUE, RUT, RES, ERE, SEE
Bonus words:
QUESTER, RETUSE, QUEERS, STERE, TRUES, REEST, TERSE, ESTER, SUET, REES, SERE, ERST, RETE, TREE, RUTS, TEES, UTES, TRES, RUSE, SEER, RUES, SUE, SET, SER, TEE, USE, RUE, RUT, RES, ERE, SEE