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9 letter words:

bulnbulns13,

8 letter words:

bulnbuln12,

7 letter words:

bulbuls11,

6 letter words:

bulbul10,

5 letter words:

blubs9, bubus9, bulbs9, slubb9, bulls7, bunns7, lulus5, nulls5,

4 letter words:

blub8, bubs8, bubu8, bulb8, bull6, bunn6, buns6, nubs6, slub6, snub6, lulu4, null4, nuns4, sulu4, sunn4, ulus4,

3 letter words:

bub7, bun5, bus5, nub5, sub5, nun3, nus3, sun3, ulu3, uns3,

2 letter words:

nu2, un2, us2,