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4 letter words:

zobu15, budi7, budo7,

3 letter words:

biz14, dzo13, bid6, bod6, bud6, dib6, dob6, dub6, bio5, boi5, obi5, dui4, duo4, oud4, udo4,

2 letter words:

zo11, bi4, bo4, ob4, di3, do3, id3, od3, io2, oi2, ou2,