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Level 12 - DRBIUUMI
The answer to this puzzle is:
Words: MIDRIB, DURUM, MURID, IBID, MIDI, BRIM, MIRI, BIDI, BURD, IMID, DRUB, DRIB, MUD, RID, BUM, RIB
Bonus words:
MIDRIB, DURUM, MURID, IBID, MIDI, BRIM, MIRI, BIDI, BURD, IMID, DRUB, DRIB, MUD, RID, BUM, RIB