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4 letter words:

bios6, bise6, obes6, obis6,

3 letter words:

bes5, bio5, bis5, bos5, obe5, obi5, sib5, sob5, oes3, ose3, sei3,

2 letter words:

be4, bi4, bo4, es2, is2, oe2, oi2, os2, si2, so2,