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5 letter words:

fitts8, tifts8,

4 letter words:

fist7, fits7, fitt7, sift7, tift7, tits4,

3 letter words:

fit6, ifs6, sif6, its3, sit3, tis3, tit3,

2 letter words:

if5, is2, it2, si2, st2, ti2,