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5 letter words:

obits7,

4 letter words:

bios6, bits6, bots6, obis6, obit6, stob6,

3 letter words:

bio5, bis5, bit5, bos5, bot5, obi5, sib5, sob5, its3, sit3, sot3, tis3,

2 letter words:

bi4, bo4, is2, it2, oi2, os2, si2, so2, ti2, to2,