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Level 12 - CEOMBNI
The answer to this puzzle is:
Words: COMBE, BIOME, MONIE, MIEN, MENO, BINE, EMIC, CION, EBON, CONI, NOME, BICE, CINE, ICON, COMB, ION, ICE, CON, MEN, MON, BIO, MIC, COB, ONE, EON, NIB, MOB, NOM, BIN
Bonus words:
COMBE, BIOME, MONIE, MIEN, MENO, BINE, EMIC, CION, EBON, CONI, NOME, BICE, CINE, ICON, COMB, ION, ICE, CON, MEN, MON, BIO, MIC, COB, ONE, EON, NIB, MOB, NOM, BIN