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4 letter words:

kiwi11,

3 letter words:

wiz15, biz14, kow10, wok10, bok9, kob9, bow8, koi7, oik7, iwi6, bio5, boi5, obi5,

2 letter words:

zo11, ki6, ko6, ow5, wo5, bi4, bo4, ob4, io2, oi2,