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Level 13 - NUIADCEE
The answer to this puzzle is:
Words: EUCAINE, DECANE, EDENIC, AEDINE, CNIDAE, UNCIAE, CANID, ADIEU, CANED, NICAD, NUDIE, DIENE, DUNCE, DEICE, UNDEE, ACNED, CNIDA, ADUNC, INDUE, ENDUE, UNCIA, EDUCE, DACE, CADI, DENI, EIDE, CUED, CAID, CEDI, DUCI, ACED, ACNE, ICED, CEDE, CINE, CAIN, CADE, DENE, DUCE, AIDE, UNDE, DUE, AID, DIE, AND, END, DEN, ICE, CUE, ANI, CUD, CAN, NEE, DUN, CAD, DIN, ACE
Bonus words:
EUCAINE, DECANE, EDENIC, AEDINE, CNIDAE, UNCIAE, CANID, ADIEU, CANED, NICAD, NUDIE, DIENE, DUNCE, DEICE, UNDEE, ACNED, CNIDA, ADUNC, INDUE, ENDUE, UNCIA, EDUCE, DACE, CADI, DENI, EIDE, CUED, CAID, CEDI, DUCI, ACED, ACNE, ICED, CEDE, CINE, CAIN, CADE, DENE, DUCE, AIDE, UNDE, DUE, AID, DIE, AND, END, DEN, ICE, CUE, ANI, CUD, CAN, NEE, DUN, CAD, DIN, ACE