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4 letter words:

fisc9, sync9, fins7, yins7,

3 letter words:

icy8, fin6, ifs6, nys6, sif6, sny6, syn6, yin6, cis5, sic5, ins3, nis3, sin3,

2 letter words:

fy8, if5, ny5, in2, is2, si2,