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9 letter words:

sissified13,

6 letter words:

diesis7, disses7, isseis6,

5 letter words:

defis9, seifs8, sides6, issei5, sises5,

4 letter words:

defi8, difs8, feds8, fids8, fess7, seif7, dies5, diss5, ides5, side5, seis4,

3 letter words:

def7, dif7, fed7, fid7, efs6, fes6, fie6, ifs6, die4, dis4, eds4, ids4, ess3, sei3, sis3,

2 letter words:

ef5, fe5, if5, de3, ed3, id3, es2, is2, si2,