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Level 12 - CEINECS
The answer to this puzzle is:
Words: NIECES, ECESIC, CINES, CENSE, SEINE, CEES, ESNE, SINE, ICES, CINE, SEC, INS, SEN, SIC, NEE
Bonus words:
NIECES, ECESIC, CINES, CENSE, SEINE, CEES, ESNE, SINE, ICES, CINE, SEC, INS, SEN, SIC, NEE