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5 letter words:

unwit8,

4 letter words:

twin7, bint6, bunt6, unit4,

3 letter words:

win6, wit6, bin5, bit5, bun5, but5, nib5, nub5, tub5, nit3, nut3, tin3, tui3, tun3,

2 letter words:

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