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4 letter words:

biog7,

3 letter words:

bow8, wig7, wog7, big6, bog6, bug6, gib6, gob6, gub6, bio5, boi5, obi5, gio4,

2 letter words:

ow5, wo5, bi4, bo4, ob4, gi3, go3, gu3, ug3, io2, oi2, ou2,