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Level 18 - DBFLUOTU
The answer to this puzzle is:
Words: TUBFUL, FLOUT, LOFT, FLUB, DOLT, LOUT, BLOT, TOLD, TOFU, BOUT, FOLD, DUB, OLD, BOD, OFT, LOB, FOB, OUD, FLU, OUT, BUD
Bonus words:
TUBFUL, FLOUT, LOFT, FLUB, DOLT, LOUT, BLOT, TOLD, TOFU, BOUT, FOLD, DUB, OLD, BOD, OFT, LOB, FOB, OUD, FLU, OUT, BUD