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4 letter words:

birk10, bork10, pork10, biro6, brio6,

3 letter words:

kip9, kob9, kop9, bop7, irk7, kir7, koi7, kor7, bio5, bro5, obi5, orb5, poi5, pro5, rib5, rip5, rob5,

2 letter words:

ki6, bi4, bo4, op4, pi4, oi2, or2,