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6 letter words:

biffer14,

5 letter words:

fifer11, brief10, fiber10, fibre10,

4 letter words:

biff12, fief10, fife10, riff10, frib9, fier7, fire7, reif7, rife7, bier6, brei6, brie6,

3 letter words:

eff9, iff9, fib8, erf6, fer6, fie6, fir6, ref6, rif6, reb5, rib5, ire3, rei3,

2 letter words:

ef5, fe5, if5, be4, bi4, er2, re2,