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Level 15 - CGANIKB
The answer to this puzzle is:
Words: CAKING, BAKING, ACING, KIANG, KAIN, BANI, KINA, AKIN, GINK, AGIN, BANG, NICK, CAIN, CIG, NAB, BAG, BIG, GIN, BIN, KIN, ANI, CAN, GAB, NIB
Bonus words:
CAKING, BAKING, ACING, KIANG, KAIN, BANI, KINA, AKIN, GINK, AGIN, BANG, NICK, CAIN, CIG, NAB, BAG, BIG, GIN, BIN, KIN, ANI, CAN, GAB, NIB