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6 letter words:

unbitt8,

4 letter words:

bint6, bitt6, bunt6, butt6, tint4, unit4,

3 letter words:

bin5, bit5, bun5, but5, nib5, nub5, tub5, nit3, nut3, tin3, tit3, tui3, tun3, tut3, uni3,

2 letter words:

bi4, in2, it2, nu2, ti2, un2, ut2,