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Level 10 - PLOIEC
The answer to this puzzle is:
Words: OLEIC, COLE, LOCI, LOPE, PICE, LIPE, CEIL, CLOP, LEI, PEC, LOP, POI, CEL, LIE, ICE, PIC, OIL, LIP, COP, POL, OLE, COL, PIE
Bonus words:
OLEIC, COLE, LOCI, LOPE, PICE, LIPE, CEIL, CLOP, LEI, PEC, LOP, POI, CEL, LIE, ICE, PIC, OIL, LIP, COP, POL, OLE, COL, PIE