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5 letter words:

bucko13,

4 letter words:

bock12, buck12, bouk10, buik10,

3 letter words:

bok9, ick9, kob9, cob7, cub7, koi7, oik7, ouk7, bio5, boi5, obi5,

2 letter words:

ki6, ko6, bi4, bo4, ob4, io2, oi2, ou2,