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Level 18 - RDCIKER
The answer to this puzzle is:
Words: RICKED, DICKER, IRKED, DRECK, CRIER, DRIER, DICER, RICER, RICED, DIKER, ICKER, RIDER, DIRER, DREK, KEIR, CEDI, CIRE, DECK, DICE, DIRK, ICED, CRED, RICK, DICK, DIKE, IRK, ERR, REC, IRE, RID
Bonus words:
RICKED, DICKER, IRKED, DRECK, CRIER, DRIER, DICER, RICER, RICED, DIKER, ICKER, RIDER, DIRER, DREK, KEIR, CEDI, CIRE, DECK, DICE, DIRK, ICED, CRED, RICK, DICK, DIKE, IRK, ERR, REC, IRE, RID