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5 letter words:

fibro10,

4 letter words:

forb9, frib9, biro6, brio6,

3 letter words:

fib8, fob8, fir6, for6, fro6, orf6, rif6, bio5, boi5, bor5, bro5, obi5, orb5, rib5, rob5,

2 letter words:

if5, of5, bi4, bo4, ob4, io2, oi2, or2,