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5 letter words:

finis8,

4 letter words:

fils7, fini7, fins7, lins4, nils4, nisi4,

3 letter words:

fil6, fin6, ifs6, sif6, ins3, lin3, lis3, nil3, nis3, sin3,

2 letter words:

if5, in2, is2, li2, si2,