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4 letter words:

cobs8, bios6, boss6, coss6, obis6, sibs6, sics6, sobs6,

3 letter words:

cob7, bio5, bis5, bos5, cis5, cos5, obi5, sib5, sic5, sob5, sis3, sos3,

2 letter words:

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