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4 letter words:

bubo8,

3 letter words:

bib7, bob7, bop7, bub7, pub7, bio5, boi5, obi5, oup5, piu5, poi5, upo5,

2 letter words:

bi4, bo4, ob4, op4, pi4, po4, up4, io2, oi2, ou2,