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Level 12 - CNNAGHIG
The answer to this puzzle is:
Words: CAGING, ACHING, CANING, ACING, CHANG, AHING, GIGA, AGIN, NIGH, CAIN, CHIA, CHAI, NAH, NAN, CHI, CIG, GIN, ANI, HAG
Bonus words:
CAGING, ACHING, CANING, ACING, CHANG, AHING, GIGA, AGIN, NIGH, CAIN, CHIA, CHAI, NAH, NAN, CHI, CIG, GIN, ANI, HAG