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4 letter words:

cobs8, cubs8, bios6, boos6, coos6, obis6,

3 letter words:

cob7, cub7, bio5, bis5, boo5, bos5, bus5, cis5, coo5, cos5, obi5, sib5, sic5, sob5, sub5, sou3,

2 letter words:

bi4, bo4, is2, oi2, os2, si2, so2, us2,