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Level 12 - XEPRSET
The answer to this puzzle is:
Words: PREXES, EXSERT, PETERS, PESTER, PRESET, EXERTS, STREP, SPEER, REXES, PRESE, PREES, PERES, TERSE, SPREE, STERE, ESTER, EXERT, TREES, PERSE, REEST, PREST, PETER, RETE, PERE, REPS, REES, PETS, PERT, EXES, PEES, SEEP, TRES, ERST, PEST, TEES, SEPT, SEER, SERE, SEX, SET, ERE, TEE, SER, RES, REP, PEE, SEE
Bonus words:
PREXES, EXSERT, PETERS, PESTER, PRESET, EXERTS, STREP, SPEER, REXES, PRESE, PREES, PERES, TERSE, SPREE, STERE, ESTER, EXERT, TREES, PERSE, REEST, PREST, PETER, RETE, PERE, REPS, REES, PETS, PERT, EXES, PEES, SEEP, TRES, ERST, PEST, TEES, SEPT, SEER, SERE, SEX, SET, ERE, TEE, SER, RES, REP, PEE, SEE