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Level 9 - OOONBTKE
The answer to this puzzle is:
Words: NETBOOK, BEKNOT, BETOOK, OBENTO, BETON, EBOOK, BENTO, TOON, EBON, KENO, KOTO, KETO, BONK, TOKE, KOBO, BOON, KNOT, NOOK, KENT, BENT, TOOK, BOOK, OBOE, ONTO, NOT, KEN, ONO, EON, BOO, BOT, TON, TOO, ONE
Bonus words:
NETBOOK, BEKNOT, BETOOK, OBENTO, BETON, EBOOK, BENTO, TOON, EBON, KENO, KOTO, KETO, BONK, TOKE, KOBO, BOON, KNOT, NOOK, KENT, BENT, TOOK, BOOK, OBOE, ONTO, NOT, KEN, ONO, EON, BOO, BOT, TON, TOO, ONE