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4 letter words:

bios6, bois6, obis6,

3 letter words:

bio5, bis5, boi5, bos5, bus5, obi5, obs5, sib5, sob5, sub5, ios3, iso3, ous3, sou3, sui3,

2 letter words:

bi4, bo4, ob4, io2, is2, oi2, os2, ou2, si2, so2, us2,