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Level 13 - ROERPME
The answer to this puzzle is:
Words: ROMPER, MOPER, ROPER, ORMER, REPRO, MERER, PROEM, PERE, ROMP, REPO, ROME, PERM, MOPE, OMER, ROE, MOR, REM, PEE, REP, ROM, ERR, POM, ERE
Bonus words:
ROMPER, MOPER, ROPER, ORMER, REPRO, MERER, PROEM, PERE, ROMP, REPO, ROME, PERM, MOPE, OMER, ROE, MOR, REM, PEE, REP, ROM, ERR, POM, ERE