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5 letter words:

combi11,

4 letter words:

comb10, mico8, ombu8, umbo8,

3 letter words:

bum7, cob7, cub7, cum7, mib7, mic7, mob7, moc7, bio5, boi5, moi5, mou5, obi5,

2 letter words:

bi4, bo4, mi4, mo4, mu4, ob4, om4, um4, io2, oi2, ou2,