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Level 19 - CCKTOOOA
The answer to this puzzle is:
Words: ACOCK, COACT, KOTO, COCK, COOT, COCO, TOOK, COCA, TACK, COT, TOO, COO
Bonus words:
ACOCK, COACT, KOTO, COCK, COOT, COCO, TOOK, COCA, TACK, COT, TOO, COO