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Level 15 - PLPCIER
The answer to this puzzle is:
Words: CRIPPLE, LIPPER, CRIPE, PLIER, PICE, LIRE, RILE, PERP, LIER, RIEL, CIRE, LIPE, PERI, CEIL, PREP, PIER, PEC, CEL, LIE, RIP, ICE, PIC, PER, REP, IRE, PIP, PIE, REC, PEP, LEI
Bonus words:
CRIPPLE, LIPPER, CRIPE, PLIER, PICE, LIRE, RILE, PERP, LIER, RIEL, CIRE, LIPE, PERI, CEIL, PREP, PIER, PEC, CEL, LIE, RIP, ICE, PIC, PER, REP, IRE, PIP, PIE, REC, PEP, LEI