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Level 20 - DEOPPRD
The answer to this puzzle is:
Words: ODDER, DOPED, PORED, ROPED, DOPER, PREOP, PEDRO, PERP, DORE, DORP, EDDO, OPED, REPO, RODE, PREP, REDD, REDO, DOER, ORE, DOE, REP, ROE, ODE, PEP
Bonus words:
ODDER, DOPED, PORED, ROPED, DOPER, PREOP, PEDRO, PERP, DORE, DORP, EDDO, OPED, REPO, RODE, PREP, REDD, REDO, DOER, ORE, DOE, REP, ROE, ODE, PEP