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Level 21 - EETPSRX
The answer to this puzzle is:
Words: PETERS, EXERTS, EXSERT, PESTER, PRESET, PREXES, STERE, TERSE, STREP, PREES, SPEER, PRESE, REXES, SPREE, PERES, REEST, PREST, PETER, PERSE, EXERT, ESTER, TRES, REPS, REES, PEER, STEP, PETS, TEES, PEST, PERE, PEES, EXES, ERST, SERE, SEPT, SEER, SEEP, RETE, PERT, TEE, SER, RES, REP, PEE, ERE
Bonus words:
PETERS, EXERTS, EXSERT, PESTER, PRESET, PREXES, STERE, TERSE, STREP, PREES, SPEER, PRESE, REXES, SPREE, PERES, REEST, PREST, PETER, PERSE, EXERT, ESTER, TRES, REPS, REES, PEER, STEP, PETS, TEES, PEST, PERE, PEES, EXES, ERST, SERE, SEPT, SEER, SEEP, RETE, PERT, TEE, SER, RES, REP, PEE, ERE