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5 letter words:

snift8,

4 letter words:

fins7, fist7, fits7, sift7, nits4, snit4, tins4,

3 letter words:

fin6, fit6, ifs6, sif6, ins3, its3, nis3, nit3, sin3, sit3, tin3, tis3,

2 letter words:

if5, in2, is2, it2, si2, st2, ti2,