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Level 18 - DRUNGBUY
The answer to this puzzle is:
Words: DUNGY, BRUNG, DRUB, BUND, DURN, BURD, BUNG, RUNG, GRUB, BURG, DUNG, BURY, BUY, DUG, NUB, DUN, BUG, DRY, GNU
Bonus words:
DUNGY, BRUNG, DRUB, BUND, DURN, BURD, BUNG, RUNG, GRUB, BURG, DUNG, BURY, BUY, DUG, NUB, DUN, BUG, DRY, GNU