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4 letter words:

biog7,

3 letter words:

bop7, pub7, big6, bog6, bug6, gib6, gip6, gob6, pig6, pug6, bio5, obi5, piu5, poi5, upo5,

2 letter words:

bi4, bo4, op4, pi4, up4, go3, oi2,