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7 letter words:

obvious12,

6 letter words:

ovibos11,

4 letter words:

bios6, boos6, obis6,

3 letter words:

vis6, bio5, bis5, boo5, bos5, bus5, obi5, sib5, sob5, sub5, sou3,

2 letter words:

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