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9 letter words:

bilirubin13,

5 letter words:

blurb9, blini7, bruin7, burin7, libri7,

4 letter words:

blub8, bulb8, burb8, birl6, blin6, blur6, brin6, burl6, burn6, liri4, nurl4, ruin4,

3 letter words:

bib7, bub7, bin5, bun5, bur5, lib5, nib5, nub5, rib5, rub5, urb5, lin3, nil3, rin3, run3, urn3,

2 letter words:

bi4, in2, li2, nu2, un2,