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6 letter words:

obiism10,

4 letter words:

mibs8, mobs8, bios6, ibis6, miso6, obis6,

3 letter words:

mib7, mob7, bio5, bis5, bos5, ism5, mis5, mos5, obi5, oms5, sib5, sim5, sob5, som5,

2 letter words:

bi4, bo4, mi4, mo4, om4, is2, oi2, os2, si2, so2,