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Level 13 - NCTNNIEO
The answer to this puzzle is:
Words: NOETIC, CONINE, INCENT, NOCENT, INTONE, NONCE, CENTO, CONTE, TENON, TONNE, ONTIC, NONET, CONIN, NINON, ONCET, NITON, NITE, CONN, INTO, ETIC, OTIC, CINE, COTE, NEON, CONI, TINE, CION, CITE, ICON, EON, ETC, COT, NOT, TIN, ONE, CON, ICE, TIC, NIT, ION, TOE, INN, TEN
Bonus words:
NOETIC, CONINE, INCENT, NOCENT, INTONE, NONCE, CENTO, CONTE, TENON, TONNE, ONTIC, NONET, CONIN, NINON, ONCET, NITON, NITE, CONN, INTO, ETIC, OTIC, CINE, COTE, NEON, CONI, TINE, CION, CITE, ICON, EON, ETC, COT, NOT, TIN, ONE, CON, ICE, TIC, NIT, ION, TOE, INN, TEN