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4 letter words:

boko10, book10, kobo10,

3 letter words:

kow10, wok10, bok9, kob9, bow8, koi7, oik7, woo6, bio5, boi5, boo5, obi5, obo5,

2 letter words:

ki6, ko6, ow5, wo5, bi4, bo4, ob4, io2, oi2, oo2,