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6 letter words:

fistic11,

4 letter words:

fisc9, fist7, fits7, sift7, cist6, cits6, tics6, isit4,

3 letter words:

fit6, ifs6, sif6, cis5, cit5, sic5, tic5, its3, sit3, tis3,

2 letter words:

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